Law enforcement officers announced that they did not find an explosive device in the car that caused a stir in the U.S. Congress. Still, they found materials that could be used to assemble a bomb, according to a press release from the Capitol police.

“No bomb was found in the car, but materials potentially suitable for making an explosive device were seized from the pickup truck,” the Capitol Police said in a press release.

Reports of a car with explosives parked near the Library of Congress forced authorities to evacuate people from nearby buildings and block roads. After several hours of negotiations, the driver surrendered to the police. It turned out to be a 49-year-old resident of North Carolina, Floyd Ray Roseberry.

The white man communicated with the police through handwritten signs but arranged a video broadcast on social networks, during which he spoke confusingly about the “revolution,” “patriots” and promised that if they tried to eliminate him, “two and a half” city blocks would fly up into the air.

A representative of the Capitol police said at a briefing that nothing yet indicates that the attacker had accomplices. The detainee turned out to be a resident of North Carolina who recently lost his mother. He will be charged with a criminal offense.

“The U.S. Capitol Police are working together with the FBI’s Washington field office to clarify Roseberry’s past and his motives,” the release says.

In an interview with the Reuters news agency, the former wife of the suspect said that the man she divorced eight years ago has schizophrenia. According to her, the ex-husband has repeatedly threatened her and his sister with firearms in the past. At the same time, the man opened fire.