A Florida man accused of posting online threats to carry out mass violence has been arrested and charged with making an interstate threat and a weapon violation, federal court records show.

Alexander Lightner, 26, of Venice, Florida, allegedly posted comments online that were “intended to convey the message that he was planning to conduct a racially or ethnically motivated mass casualty event,” according to an affidavit.

He was interviewed by FBI agents from the bureau’s Tampa Field Office a week later on January 5, and law enforcement executed a search warrant at Lightner’s home before he was arrested.

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While searching Lightner’s home, FBI agents found an unlawful firearm suppressor in a laundry hamper of a bedroom he shared with his brother and “propaganda regarding white supremacist and accelerationist ideology in Lightner’s bedroom,” according to court records.