Authorities say two adults and two young children were killed in an early morning house fire in the southern Colorado city of Pueblo.

Firefighters believe the children were about 3 months and 2 years old.

The fire was reported at about 2 a.m. Tuesday.

Pueblo police Sgt. Steve Etienne (EH’-tee-en) says flames and smoke were pouring from the home when firefighters arrived and no one escaped.

Investigators are trying to determine the cause of the fire. So far, they’ve ruled out a cooking fire. Police have been involved but the fire department says that’s standard in fatal blazes and there’s no indication of any criminal intent.