Terry Tang?and Paul Davenport

PHOENIX: Authorities trying to rescue a family begging for help after their 26-year-old son opened fire in their Phoenix home arrived to a chaotic crime scene they could not prepare for.

The shooter ignited a raging fire and was still inside. Officers donned breathing gear, grabbed fire hoses and ran in, hoping to save lives. They pulled out two victims, but they had to make a hasty retreat as bullets flew their way.

The violence played out in a cul-de-sac of quiet, suburban family homes Tuesday morning. Authorities eventually found Vic Buckner, 50, Kimberly Buckner, 49, and their 18-year-old daughter, Kaitlin Buckner, who were all pronounced dead. A 6-year-old daughter, Emma, later died at a hospital.

The shooter was the couple’s son, Alex Arthur Buckner, who was fatally shot by police, Sgt. Trent Crump said.

Three officers were treated for smoke inhalation.

The chaos woke up residents in surrounding houses, forcing some to evacuate just before dawn.

The ordeal began shortly before 5 a.m. when Kaitlin Buckner called 911, pleading for help and saying that her brother had shot her, Crump said. The first officers on the scene ran into the burning house because they felt they had to act quickly.

All the victims had gunshot wounds, but a medical examiner will determine their causes of death, authorities said.