This story has been updated.
A threatening letter received by an employee with the Nassau Board of Elections office in Mineola caused an evacuation of the office due to a perceived threat, Nassau County Police said.
The incident began around 11:57 a.m., Monday, April 29, at 240 Old County Road, when police were alerted to a "threat."
Police say the "immediate area was evacuated," and emergency response units and detectives are on the scene.
Following a search of the area, and the building, no threat was found, police said.
The election's office remained closed as detectives continue their investigation, they added.
Click here to sign up for Daily Voice's free daily emails and news alerts.