CHICOPEE, Mass. (WWLP) – Students at Chicopee Comprehension High School were dismissed early Monday morning after a “questionable” email prompted a lockdown and shelter in place.

According to the Chicopee Police Department, at around 11: 43 a.m., the school department’s email had been compromised and a suspicious email was sent out to students and staff with a threat to the school. Police did not specify what type of threat was sent in the email.

Following the discovery of the threat, the school was put on lockdown and a shelter in place was activated.

Local and State Police both responded to the school at around 11:49 a.m., along with explosion detection K9’s to do a sweep of the building’s exits and common areas. No suspicious items or evidence were found during the search.

Once the school was cleared, students were dismissed 15 minutes early.

The investigation into the threat is ongoing, according to the Chicopee Police Department, who are working with the school’s I.T. Department to determine the origin of the email and the person(s) responsible.

Anyone with information that could help police with their investigation is asked to call the Chicopee Police Detective Bureau at 413-594-1740.