Santa Monica Police Chief Jacqueline Seabrooks said on Twitter that the 20-year-old man 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.

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According to Indiana court records, Howell was charged in October 2015 with intimidation and felony pointing a firearm at another person. On April 19, Howell pleaded guilty to misdemeanor intimidation, and prosecutors dropped the pointing a firearm charge. Court records show he was sentenced to a year in state prison and placed on probation. Under the deal, He agreed to forfeit all weapons during his term of probation.