FBI Raids Home of Person of Interest Robert Crimo in Mass Shooting

FBI agents wearing tactical gear and brandishing assault rifles poured out of an armored vehicle Monday and raided the suburban Chicago home of Robert Crimo -- the person of interest in the July 4th mass shooting -- and TMZ obtained exclusive video of the raid.

The scene unfolded around 4:30 PM Monday in Highwood, Illinois -- where Robert Crimo lives with his family -- two hours before the alleged killer was taken into custody by police after a brief car chase. Cops identified Crimo as a "person of interest" in the heinous shootings and recovered a high-powered rifle from the scene.

Video from the raid shows two teams of FBI agents with guns poised ... walking up to the front and side entrances of the house. One of the agents is heard banging on the front door and yelling, "It's The FBI. If you're inside, come out with your hands up."

The other team is seen walking along the side of the house and pointing their guns at the windows, before entering the home through an unlocked door.

Witnesses tell TMZ ... the feds stayed there for several hours taking photos, but it's unclear if they removed evidence from the home or made arrests. Some agents were overheard saying they had viewed "some interesting things."

During the raid, we're told Crimo's father drove up, spoke with the FBI and made a call to his son, leaving a voicemail that the feds wanted to talk to him, the witnesses said.