A man smelling of fuel showed up at the U.S. Capitol visitor center with a flashlight and a firearm on Election Day, prompting police to close the building to tours for the rest of the day, police said.

US Capitol Police (USCP) said the man was going through security at the Capitol Visitor Center around 12:30 p.m. when officers discovered the flashlight and flare gun in his jacket. In the backpack, officers found bottles that appeared to have fuel residue, and an officer noticed the man had a faint odor of gasoline or some type of accelerant, U.S. Capitol Police Chief Thomas Manger said. The smell became much stronger when they opened the backpack, he said.

Officers arrested the suspect, a 28-year-old man from Michigan. Investigators were still questioning him as of 3:30 p.m., police said. Police have not yet released his name or offered a possible motive.

Manger said the man had “quite a lot” of documents with him and said he planned to turn them over to Congress. Investigators were still sifting through the papers and trying to decipher the man’s plans.

“It didn’t look like he splashed all over his clothes … so it’s unknown at this point what his intent was,” Manger said.

Capitol Police Chief J. Thomas Manger provided an update on the arrest Tuesday afternoon.

Investigators tracked the suspect’s previous movements and located his vehicle at 9th Street and Maryland Avenue NE. The scene has been cleared, they said.

Manger said the video shows the man walking slowly toward the visitor center and looking around. He said the suspect was wearing heavier clothing than was necessary for the unseasonably warm November day.

Once at the security screening area, the man hesitated for a moment when an officer asked him to put his belongings in the machine, Manger said.

Manger said his department has been activated heightened alert for any potential violence on Election Day, but “there is no indication at this time that it has anything to do with the election.”

Every attorney general in the country published a letter on Monday condemning possible political violence.

“We expect the American people to respond peacefully,” regardless of the outcome, the attorneys general said in the letter.

Over the past year, the News4 I-Team has reported on the troubling possibility that politically motivated violence could mar this election year. Investigative reporter Ted Oberg explains how some poll workers have already been affected.

News4’s I-Team found that several states across the country have taken new security measures to ensure the safety of election workers.

Last week in Maryland, someone followed a poll worker home. The person told police he wanted to “make sure the ballots were taken to the right place.”

Experts have told the News4 I-Team for months that support for politically motivated violence is at alarming levels.