GARFIELD, N.J. (CBSNewYork) – A New Jersey high school is closed Tuesday as police investigate a threat.

Garfield High School in Bergen County announced the sudden closure Monday night on Twitter.

“Boilmakers: due to a threat that is currently being investigated by Garfield Police, GHS will be closed tomorrow,Tuesday,10/16. All other Garfield schools will be open,” the school posted.

The school did not disclose the nature or source of the threat.