Authorities: 4 killed in Colorado house fire

An early morning house fire has killed four people in the southern Colorado city of Pueblo.

Pueblo police Sgt. Steve Etienne says the fire was reported about 2 a.m. Tuesday in a residential area in east Pueblo. He says flames and smoke were pouring from the home when firefighters arrived.

Etienne says some details of the fire are not being released, including the ages and genders of the victims. He says no one escaped.

Investigators say they don't know how the fire started and they're treating it as a criminal investigation.