PA investigators visit Trump shooter Thomas Crooks' home Sunday for over an hour
Crooks, 20, opened fire at a Trump rally in Butler, Pennsylvania, on July 13
{{#rendered}} {{/rendered}}A pair of plainclothes investigators, who appeared to be federal agents, visited the Pennsylvania home of former President Trump shooter Thomas Matthew Crooks on Sunday – more than one week after the 20-year-old opened fire at a campaign rally.
The men, one carrying a large bag, were greeted at the door by a man who invited them in around 2 p.m.
They remained inside the modest Milford Drive house in the quiet Bethel Park suburb for 85 minutes before returning to their black SUV and driving off.
{{#rendered}} {{/rendered}}TIMELINE: TRUMP ASSASSINATION ATTEMPT
Two investigators, who appeared to be federal agents, enter Thomas Crooks' home. (Derek Shook/Fox News Digital)
Later the same afternoon, a pair of men in black suits knocked on a neighbor's door several times and waited. No one answered. They walked to the side of the house and emerged a few minutes later.
The slain shooter's father has been holed up inside the brick home since his troubled son's failed assassination attempt that left Trump with a bloodied ear, firefighter Corey Comperatore dead and two others seriously wounded.
{{#rendered}} {{/rendered}}A counter sniper stopped the shooter with a single shot to the head.
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Two men who appeared to be FBI agents leave Thomas Crooks' home. (Derek Shook/Fox News Digital)
His sister, Katie Crooks, has also been spotted at the family home bringing in takeout and carrying a pizza and a bottle of Mountain Dew.
{{#rendered}} {{/rendered}}It was not immediately clear if the shooter's mother, Mary Elizabeth Crooks, was home. Both parents are licensed professional counselors.
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It was revealed Saturday for the first time that Thomas Matthew Crooks used a drone to scope out the rally site prior to the assassination attempt, and the FBI has recovered the device.
{{#rendered}} {{/rendered}}The FBI, which is spearheading the investigation, has yet to identify any ideological or political views that could explain Crooks' motivations.
Investigators visit Thomas Crooks' neighbor. (Derek Shook/Fox News Digital)
Investigators searched his phone and found photos of President Biden, Trump and other senior government officials.
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They also found searches for the dates of Trump's rallies, the Democratic National Convention and the term major depressive disorder.
The Associated Press contributed to this report.