PHOENIX — Authorities are investigating a Christmas shooting at Sky Harbor Airport in Phoenix that left three people injured by gunfire and another person stabbed. Police said the shooting was related to a family dispute.

Phoenix police said the evening shooting happened at around 9:45 p.m. at an airport restaurant that is outside the security checkpoints in Terminal 4.

An adult female and two adult males were shot, leaving the female with injuries police describe as life-threatening. The two men were in stable condition and expected to survive, police said in a statement. The man hospitalized with at least one stab wound was in stable condition.

The group of people all knew each other and had a physical fight that led one of them pulling a gun, police said.

“I do believe that this was a family dispute that escalated,” Phoenix police Sgt. Mayra Reeson told reporters.

After the gunfire, a man and a girl were detained in an airport parking garage nearby. Police did not immediately release information on possible charges. They were still investigating.

— The Associated Press