Dec. 26 (UPI) -- Operations are back to normal at Phoenix Sky Harbor airport Thursday after an apparent family fight erupted into gunfire in the airport's busiest terminal Wednesday night, injuring four people, one critically. A fight broke out near the shopping and dining area of Terminal 4 at about 9:40 MST Christmas night. Three people were shot and another sustained a stab wound, according to the Phoenix Police Department . Advertisement According to police, the altercation broke out