Cole Tomas Allen, a 31-year-old Californian, has been identified as the culprit and is being held. According to the authorities, he booked into the hotel hosting the meal after traveling by rail from California to Chicago and then Washington.

According to acting U.S. Attorney General Todd Blanche, Allen is not cooperating with law authorities and is anticipated to face many charges on Monday.

Police who spoke with Allen's family also looked through his writings and computer gadgets, and they think he planned to target Trump administration officials during the dinner.