WATERTOWN — Two teenagers and their mother’s boyfriend are dead in what appears to be a murder-suicide in a Connecticut home, police said Wednesday.

Officers responded to the Watertown home at about 10 p.m. Tuesday after a woman called 911 to say her boyfriend had shot her son and daughter, police said.

The siblings, ages 15 and 16, were taken to Waterbury Hospital where they were pronounced dead, Deputy Chief Joshua Bernegger said.

Police also found a man dead at the scene of an apparently self-inflicted gunshot wound.

No names have been released.

The teens' mother was not shot and is cooperating with the investigation, police said.

Watertown Superintendent of Schools Rydell Harrison in a message to parents Wednesday said the victims were former Watertown students, but were not currently enrolled at Watertown High School,.

Crisis teams are being made available Wednesday at the high school and middle school to help students and staff.