Santa Monica Police Chief Jacqueline Seabrooks said on Twitter that the suspect told one of her officers after he was arrested that he wanted “to harm Gay Pride event.” But she did not provide any details, and officials said they are still trying to sort out his motives.

Seabrooks identified him as James Howell of Indiana. A Facebook page for someone with the same name in Indiana shows a young man posing next to a white Acura similar to the one found in Santa Monica with the weapons and explosives.

At a news conference Sunday afternoon, police stressed they were still trying to figure out what Howell planned to do with the weapons.