All five schools in an upstate New York district are closed for the day because of a threat made over social media.

The Monticello Central School District announced Thursday night that its schools would be closed Friday while authorities investigate the online threat.

The Times Herald-Record of Middletown reported that the Sullivan County Sheriff�s Office says the threat was posted on Instagram under the username �blaxckhood.�

Police have requested subpoenas for tracking electronic communication and IP addresses.

Monticello is about 100 miles (160 kilometers) northwest of New York City. The district includes three elementary schools, a high school and a middle school.

(AP)