BLOOMINGTON ( – A man, woman and two children died in a house fire in Bloomington Wednesday morning.

According to the San Bernardino County Fire Department, the blaze broke out before 7:30 a.m. at a single-story home in the 17900 block of Santa Ana Avenue.

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Responding firefighters entered the home and discovered a man, woman and girl between the ages of 5 and 10 inside. The man and girl were found dead on scene, SBCFD reported. The woman was pulled out of the home unresponsive. She was transported to a nearby hospital, were she died from her injuries, the fire department said.

The body of a second child was later discovered in the home, fire officials confirmed to CBS2 Wednesday afternoon.

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It took firefighters 20 minutes to bring the blaze under control. Most of the damage was confined to a front bedroom.

The names of the victims, their relationship to one another and the exact causes of their deaths were not immediately disclosed by authorities. However, a friend identified the victims to CBS2 as a married couple with two young daughters.

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The SBCFD Office of the Fire Marshal and the San Bernardino County Sheriff’s Department is investigating the cause of the blaze and a criminal investigation has been opened.