Son shoots parents, two sisters, sets family house on fire

One Alex Buckner shot and killed his parents and two sisters before setting their house on fire on Tuesday, police say.

The Phoenix Police Department said it received two 911 calls from Kimberly and Kaitlin Buckner who claimed Alex had shot them.

By the time police got to the house, it was already on fire.

Officers heard shots fired from inside the home and saw the victims calling for help from a bedroom window, People reports.

But rescuers could only pull 18-year-old Kaitlin alive out of the fire although she died later at a local hospital.

The bodies of their parents Vic and Kimberly Bucker, and six-year-old Emma were found in different locations in the house.

26-year-old Alex was found in a room holding a gun.

He pointed his gun towards authorities and after a brief standoff was shot and killed, police say.

Although a police spokesman could not confirm the cause of death for the victims, he said all four victims were shot and inhaled a heavy amount of smoke..