WASHINGTON (AP) — Maryland authorities are announcing charges against a man accused of threatening to shoot up his workplace and identifying himself as "a joker."

Prince George's County police and prosecutors have scheduled a Wednesday news conference to reveal charges against Neil E. Prescott.

The 28-year-old Crofton man was taken into custody last Friday after the threats were reported to the police. He has been receiving an emergency psychiatric evaluation at a hospital.

The news conference is scheduled for 2 p.m. at the county courthouse in Upper Marlboro.