The man accused of starting a fire outside U.S. Sen. Bernie Sanders’ Vermont office a week ago has had past brushes with the law involving guns and a history of traveling from place to place, prosecutors say in court filings arguing that he should remain detained.

Security video shows Shant Michael Soghomonian throwing liquid at the bottom of a door opening into Sanders’ third-floor office in Burlington and setting it on fire with a lighter last Friday, according to an affidavit filed by a special agent with the Bureau of Alcohol, Tobacco, Firearms and Explosives.