At least 15,000 Black Lives Matter protestors including Star Wars actor John Boyega pack into London's Hyde Park - as British police chiefs say they are 'appalled and horrified' by George Floyd's death

• Black Lives Matter protest underway at Hyde Park in London is second major demonstration in UK so far 
• Stand Up To Racism also wants Britons to 'take the knee' on doorsteps at 6pm tonight in separate protest
• UK police chief constables have called for 'justice and accountability' and condemn violent scenes in US 
• George Floyd died after white police officer put knee on his neck in Minneapolis for nine minutes last week
• TV reporter screams as she is attacked by screwdriver-wielding man yelling 'Allahu Akbar' while at protest 

At least 15,000 Black Lives Matter protesters including singer Liam Payne and actor John Boyega gathered in London today as a show of force against the death of George Floyd in the US.

Huge crowds gathered in Hyde Park this afternoon despite ongoing social distancing rules as many campaigners wore face coverings and held signs with messages such as 'Please, I can't breathe', 'BLM' and 'Colour ≠ Crime'.

The rally comes as global demonstrations gather pace following the death of 46-year-old black man Mr Floyd who died after white police officer Derek Chauvin put his knee on his neck for nine minutes in Minneapolis on May 25. 

Today, Star Wars actor Boyega told the crowd: 'Black lives have always mattered. We have always been important. We have always meant something. We have always succeeded regardless. And now is the time. I ain't waiting.'

Police were generally keeping in the background of the protest while their helicopters circled above. Banners included 'Enough is Enough', 'Remember Smiley Culture', 'Remember Cherry Groce', and 'UK is not innocent'.

After leaving Hyde Park, the protesters clambered onto traffic lights as they marched down Park Lane towards Victoria and gathered outside Parliament. One supporter played Bob Marley’s Three Little Birds on a loudspeaker. 

One protester wore a Colin Kaepernick shirt after the black American footballer who started the knee protest in the US. Thousands of demonstrators at times went down on one knee chanting 'George Floyd, George Floyd.'

It comes after UK chief constables joined forces to say they were 'appalled and horrified' by the death and called for 'justice and accountability', while warning those attending protests to do so while maintaining a safe distance.  

Separately, anti-racism campaign group Stand Up to Racism is urging Britons to 'take the knee' on their doorsteps at 6pm tonight for a protest against discrimination which is also backing the Black Lives Matter movement. 

Protesters wearing face masks gather for the demonstration at Hyde Park this afternoon

Boyega, 28, told fellow demonstrators gathered for a Black Lives Matter protest he was 'speaking to you from my heart'. The British actor referenced two other black Americans who controversially died in the US, as well as the racist murder of Stephen Lawrence in London in 1993.

He said: 'We are a physical representation of our support for George Floyd. We are a physical representation of our support for Sandra Bland. We are a physical representation of our support for Trayvon Martin. We are a physical representation of our support for Stephen Lawrence.'

'We are are appalled and horrified': Full statement from UK chief constables on George Floyd protests 

'We stand alongside all those across the globe who are appalled and horrified by the way George Floyd lost his life. Justice and accountability should follow.

'We are also appalled to see the violence and damage that has happened in so many US cities since then. Our hearts go out to all those affected by these terrible events and hope that peace and order will soon be restored.

'In the UK we have a long established tradition of policing by consent, working in communities to prevent crime and solve problems. Officers are trained to use force proportionately, lawfully and only when absolutely necessary. We strive to continuously learn and improve. We will tackle bias, racism or discrimination wherever we find it.

'Policing is complex and challenging and sometimes we fall short. When we do, we are not afraid to shine a light on injustices or to be held to account.

'The relationship between the police and the public in the UK is strong but there is always more to do. Every day, up and down the country, officers and staff are working to strengthen those relationships and address concerns. Only by working closely with our communities do we build trust and help keep people safe.

'We know people want to make their voices heard. The right to lawful protest is key part of any democracy, which UK police uphold and facilitate. But coronavirus remains a deadly disease and there are still restrictions in place to prevent its spread, which include not gathering outside in groups of more than six people. So for whatever reason people want to come together, we ask that people continue to work with officers at this challenging time.He added: 'I'm speaking to you from my heart. Look, I don't know if I'm going to have a career after this, but f*** that.

'Today is about innocent people who were halfway through their process. We don't know what George Floyd could have achieved, we don't know what Sandra Bland could have achieved, but today we're going to make sure that won't be an alien thought to our young ones.

'I need you to understand how painful this s*** is. I need you to understand how painful it is to be reminded every day that your race means nothing and that isn't the case any more, that was never the case any more.'

He urged protesters to remain peaceful as they demonstrated over the death of Mr Floyd.

'It is very, very important that we keep control of this moment. That we make this as peaceful and as organised as possible,' he said.

'Because they want us to mess up, they want us to be disorganised, but not today.

'This message is specifically for black men, black men we need to take care of our black women.

'They are our hearts, they are our future, we cannot demonise our own, we are the pillars of the family.

'Imagine this: a nation that is set up with individual families that are thriving, that are healthy, that communicate, that raise their children in love, have a better rate of becoming better human beings, and that's what we need to create.

'Black men, it starts with you. It's done man, we can't be trash no more. We have to be better.

'You lot came today, you left your kids, and when you see your kids they're aimlessly playing, they don't understand what's going on. Today's the day that we remind them that we are dedicated and this is a lifelong dedication.

'Some of you are artists, some of you are bankers, some of you are lawyers, some of you own shop stores.

'You are important, your individual power, your individual right is very, very important, we can all join together to make this a better world.'

Protesters were initially asked to sit two metres apart unless they were in the same household and were told to keep their arms stretched out to ensure social distancing when moving around the park.

However, as numbers grew, many of the protesters were seen standing at close distance as organisers still tried to maintain appropriate spacing. 

Protesters chanted 'black lives matter' and 'we will not be silent' as they waited for the demonstration to begin.

Most of the protesters wore masks or gloves.

Filippa, a 20-year-old student, said: 'I know that I'm healthy. So this felt more important than to stay inside when I have the opportunity.'

It comes after a joint statement from UK chief constables said today: 'We stand alongside all those across the globe who are appalled and horrified by the way George Floyd lost his life.

'Justice and accountability should follow. We are also appalled to see the violence and damage that has happened in so many US cities since then. 

'Our hearts go out to all those affected by these terrible events and hope that peace and order will soon be restored.'

It added that officers in Britain have a 'long established tradition of policing by consent, working in communities to prevent crime and solve problems'.

The statement added that forces will 'tackle bias, racism or discrimination wherever we find it' but acknowledged that 'sometimes we fall short'.

It added that police would 'uphold and facilitate' the right to lawful protest, but warned demonstrators that the coronavirus lockdown is still in place.

They said: 'Coronavirus remains a deadly disease and there are still restrictions in place to prevent its spread, which include not gathering outside in groups of more than six people. 

John Boyega, the boy from Peckham who became a world star

Star Wars actor John Boyega, who was born in Peckham, South London, in 1992 to parents of Nigerian descent, has regularly spoken out about race issues.

He was also one of the last people to see Damilola Taylor alive before the ten-year-old was murdered in Peckham.

Boyega's family, who also lived in Peckham, took in the boy when he first moved to London from Lagos.

His mother Abigail worked with disabled people, and his father Samson Adegboyega is a Pentecostal minister. 

His first role was as a leopard in a school play while at primary school, before he was noticed by Theatre Peckham and started acting there from the age of nine.

Boyega’s first major film role was Attack the Block in 2011 before he made his Star Wars debut as Finn in The Force Awakens in 2015.

The 28-year-old actor has told how he has encountered racist abuse since childhood - and fears for his family and friends who live in America.

He has again been outspoken on social media in recent days following the death of Mr Floyd.

Last week he tweeted 'I f***ing hate racists' and condemned 'white racists' in an Instagram video, saying they had 'ruined the world' and that he did not want to 'work in fear' when in the US. 

So for whatever reason people want to come together, we ask that people continue to work with officers at this challenging time.'

TV reporter screams live on air as she is attacked by screwdriver-wielding man yelling 'Allahu Akbar' while covering protest

Nine News' Europe correspondent Sophie Walsh, above, was seen clearly shaken

A reporter screamed live on air as she was attacked by a man yelling 'Allahu Akbar' and wielding a screwdriver while covering the Black Lives Matter protest in London.

Nine News' Europe correspondent Sophie Walsh was attacked while broadcasting this morning, according to the Australian network.

Footage was not captured of the attack but Ms Walsh can be heard screaming and seen clearly shaken afterwards while relaying the incident to one of her colleagues.

She said: 'Sorry, I just had someone come up and try and... yeah. 

'A man just came up and grabbed me. He's not armed. A man just came up and grabbed me though.'

A fellow presenter reported the attacker 'made motions to stab her' with footage showing a man being detained by two police officers and held against a car bonnet.

Ms Walsh later wrote on Twitter: 'Thank you for your messages. The man has been arrested for threats to kill and carrying a weapon. I'm shaken but okay. 

'Big thanks to my incredible cameraman Jason Conduit who chased him down armed with a light stand and got him arrested.' 

Today, Prime Minister Boris Johnson told the Commons that he can understand the anger and the grief felt following the death of Mr Floyd.

SNP Westminster Leader Ian Blackford said: 'In the seven days since George Floyd was murdered, the UK Government has not even offered words, it has not expressed that pain, it has shuttered itself in the hope no-one would notice.'

He added: 'Can I ask the Prime Minister what representations has he made to his ally Donald Trump? And at the very least Prime Minister, say it now - black lives matter.' 

The Prime Minister responded: 'Of course black lives matter and I totally understand the anger, the grief that is felt, not just in America but around the world and in our country as well.

'I totally understand that and I get that and I also support, as I've said, the right to protest.

'The only point I would make to the House is that protests should be carried out lawfully and in this country, protests should be carried out in accordance with our rules on social distancing.'

Also today, Stand Up to Racism has organised a 'take the knee' protest for 6pm as part of a day of action against discrimination in response to the death of Mr Floyd.

SUTR said the campaign was inspired by the kneeling protest staged by American football star Colin Kaepernick in 2016 that has become synonymous with the Black Lives Matter movement. 

A further demonstration by Black Lives Matter is scheduled for 1pm on Saturday in Parliament Square.

Yesterday, hundreds of people gathered outside St George's Hall in Liverpool as part of a separate Black Lives Matter protest.

Merseyside Police said in a tweet that while it recognised people's right to demonstrate peacefully they should still adhere to social distancing guidelines.

It comes as a review by Public Health England found black, Asian and minority ethnic (BAME) people are at significantly higher risk of dying from Covid-19. 

SUTR's Sabby Dhalu said: 'BAME communities are suffering disproportionately from Covid-19, economic decline and police brutality.

'We call on people to 'take the knee' on their doorstep in solidarity with George Floyd, at 6pm, Wednesday 3 June. We stand for justice for George Floyd and say Black Lives Matter.'

Large gatherings are still banned under shutdown rules, and yesterday Scottish First Minister Nicola Sturgeon asked protesters to find an alternative to physical demonstrations.

Speaking at her daily briefing in Edinburgh, she said: 'Right now, it is the case, unfortunately and regrettably, that large gatherings of people could pose a risk to health and indeed to life. 

US President Donald Trump has declared that 'the National Guard is ready' as he repeated his threat to send troops to New York City to 'put down' the Floyd protests - but the violence in the city was less severe last night.

Thousands ignored mayor Bill de Blasio's 8pm curfew to continue their demonstrations, but police arrested more than 200 people as night fell and some of the rampant destruction of the previous few days was quelled.

The calmer scenes were echoed across much of America where protesters once again turned out in force but the confrontations with police were subdued and widespread rioting was limited.

It followed a day of anger from President Trump's critics over the way he threatened to deploy the military to quell riots across the US and cleared protesters in Washington DC so he could visit damaged St John's Episcopal Church.