Two adults and a baby were killed and three firefighters injured when a firetruck and a pickup truck collided in Phoenix on Sunday morning.

A man in the pickup truck died at the scene of the crash, while a 6-month-old and a woman who were in the pickup died at the hospital, Phoenix Police Department spokesman Sgt. Vince Lewis said. The three firefighters were hospitalized and were in stable condition by Sunday afternoon, Lewis said.

The firefighters were on their way to an emergency at the time of the crash, and the truck had its lights and sirens on, police told NBC affiliate KPNX.

Officials believe the man, woman and baby who died were related, but none of the victims' names have been released.