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He had no prior criminal history, according to Prince George’s Deputy Chief Hank Stawinski.

News of the threat and police activity had the Crofton neighborhood where Mr. Prescott lives abuzz.

“With the recent event in Colorado, I think everyone is on edge to hear about something like this,” said neighbor Wilbert Brinson, who didn’t know Mr. Prescott but lived in a building adjacent to his. “People need to be more sensitive to what is going on in people’s lives so that we can support them more so they don’t go over the deep end.”

• Emily Hatton contributed to this report.