FBI agents appear to be seen canvassing Thomas Matthew Crooks' neighborhood

(Fox News)

FBI agents appeared to be seen canvassing shooter Thomas Matthew Crooks' neighborhood in Bethel Park, Pennsylvania, one week after the gunman was killed in a failed assassination attempt against former President Trump.

The agents, dressed in button up shirts, were seen driving a small black SUV. They carried documents in hand and went door to door to speak with neighbors. 

Investigators are still working to identify a motive in the shooting, which claimed the life of Corey Comperatore and led to injuries for Trump, David Dutch and James Copenhaver.

Neighbors who spoke to Fox News Digital said Crooks' family were not politically outspoken and former classmates described the shooter as a quiet loner.

Jason Kohler, who attended the same high school as Crooks, described him to Fox News as an "outcast" who was always alone and "bullied every day."

Kohler told reporters that Crooks sat alone at lunchtime and was mocked for his clothing, which often included "hunting outfits."

Julianna Grooms, who graduated one year after Crooks, also said that he dressed in camouflage or hunting attire and interacted awkwardly. In his freshman year, she said, he stood out with wide-legged jeans and Spongebob Squarepants T-shirts.

"If someone would say something to his face, he would just kind of stare at them," Grooms told the Wall Street Journal. "People would say he was the student who would shoot up the school."