A new school threat made toward a Stratford middle school is not credible, police say.

The threat was sent from an anonymous Twitter account Monday.

The post stated that there will be an attack against a middle school in Stratford Tuesday and not to send kids to school.

A letter from Stratford school officials say police are investigating Twitter threats to one or both middle schools.

Police say the Stratford Detective Bureau conducted a thorough investigation and determined the threat was not credible after 10:30 p.m.