Donald Trump puts Army on four hour notice to deploy to US streets for first time since LA riots in 1992 as Minneapolis erupts for fourth night and violent George Floyd protests sweep the country

• Violent protests demanding justice for George Floyd spread across the US Friday night
• Looting broke out in Minneapolis as protesters defied curfew and the National Guard failed to keep control
• In Atlanta, the CNN headquarters were under siege and protesters threw a smoke bomb at cops defending it 
• Protesters surrounded a police precinct in Brooklyn where an NYPD cop threw a woman to the ground 
• The White House was forced to go into temporary lockdown as demonstrators tried to scale the walls
• Scenes in Minneapolis were calmer as the National Guard and a night curfew kept most protesters in check 
• White cop Derek Chauvin was charged with murder Friday but the other three cops still walk free

Donald Trump has put the Army on notice to be deployed to US streets for the first time since the LA riots in 1992 as Minneapolis erupts for the fourth night and violent protests sweep the country over the killing of George Floyd.  

Soldiers in North Carolina and in New York have been ordered to be ready to move in within four hours while troops in Colorado and Kansas have been told to be ready within 24 hours after the president asked Defense Secretary Mark Esper for military options in tackling the escalating civil unrest spreading across America, according to sources.   

The historic move comes as violent protests demanding justice for Floyd spread across the US Friday night, with the CNN headquarters under siege in Atlanta, NYPD officers fending off rioters from a police precinct in Brooklyn and the White House forced to go into lockdown as demonstrators tried to scale the walls. 

Looting and fires broke out again in Minneapolis as protesters defied the state curfew and the National Guard failed to keep the city under control.

The protests have now reached all corners of America with break-off demonstrations springing up across states including New York, Kentucky, Texas, Georgia as the arrest of the white cop who knelt on Floyd's neck has done little to quell the anger over the black man's death.  

Chaos exploded in Atlanta as demonstrators stormed and destroyed the CNN headquarters and fired a smoke bomb at cops trying to form a barrier to keep them out. 

In New York City, shocking footage showed an NYPD officer hurling a female protester to the ground in Brooklyn, while cops defended a police precinct amid fears it would be torched.

The White House was forced to go into temporary lockdown as protesters tried to scale the walls, battled with Secret Service agents and burned American flags outside the seat of the government. 

As unrest spread across dozens of American cities Friday, Trump gave the bold order to ready the Army for deployment to Minneapolis.  

The National Guard was activated in Georgia late Friday night with as many as 500 troops deployed to Atlanta and a state of emergency issued after rioters destroyed the CNN HQ and looted a luxury shopping mall. 

The CNN headquarters bore much of the brunt of the outrage as demonstrators vandalized the media firm's logo, scrawled profanities on the building and smashed up its windows.

A standoff between cops and protesters escalated into the night as dozens of cops in riot gear formed a barricade inside the doors while protesters hurled objects at the building. 

A smoke bomb was thrown at police at one point and at least one officer was injured after they were struck by a missile of some sort. 

In New York, the NYPD clashed fiercely with protesters Friday night as thousands of cops took to the streets and hundreds of protesters descended on the 88th precinct in Brooklyn. 

New York City Mayor Bill de Blasio traveled across the city to the protest as he tweeted saying there would be a 'full review' of the night's events after footage emerged on social media of cops being violent towards protesters. 

'We have a long night ahead of us in Brooklyn. Our sole focus is deescalating this situation and getting people home safe. There will be a full review of what happened tonight. We don’t ever want to see another night like this,' de Blasio tweeted.  

Outside the Barclays Center stadium in Brooklyn, a peaceful protest turned violent when NYPD officers sprayed mace into the crowds while demonstrators set fire to banners and pushed to break through metal barricades. 

The crowds moved toward the 88th precinct with officers forced to defend the station for fear of similar scenes to those seen at the precinct in Minneapolis Thursday - where cops were forced to flee when protesters stormed the building, set it alight and cut off the gas lines.    Protests also erupted in Charlotte with police officers throwing tear gas into the crowds and the Charlotte-Mecklenburg Police Department deploying its Civil Emergency Unit and issuing a dispersal order.   

Minneapolis police officer Derek Chauvin was arrested and charged with murder and manslaughter Friday over the death of Floyd, four days after he was seen kneeling on his neck in a video of his arrest that has sparked violent protests across the country.

The 44-year-old white cop was arrested by state investigators Friday afternoon, Public Safety Commissioner John Harrington announced, as the criminal complaint revealed he kept kneeling on the black man's neck for almost 3 minutes after he fell unconscious and said 'you're talking fine' when he begged for air. 

Chauvin was one of four officers fired over Floyd's death earlier this week yet the other three officers continue to walk free.