Police in Anchorage shot and killed a 16-year-old girl as she came at them with a knife, police said Wednesday. It is the fourth fatal police-involved shooting in Alaska’s largest city since mid-May.

Anchorage Police Chief Sean Case told reporters that the shooting occurred when officers responded to a reported altercation between two family members around 11:30 p.m. Tuesday, Alaska Public Media reported. The caller said her sister threatened her with a knife.

Case said the teenager approached officers with a knife in his hand, and two of them opened fire. Police said in a statement that officers gave the teenager “several commands” but did not specify what the commands were.

“A single officer fired multiple shots,” Case said. “A second officer fired one shot with a non-lethal projectile.”

The teenager was pronounced dead in hospital.

“She would have started her penultimate year of high school on Thursday,” Case said. The girl’s name was not released.

Anchorage School District Superintendent Jharrett Bryantt said in a statement that affected students and staff will be provided with support when classes resume.

Case said department policy states that officers using non-lethal weapons must be assisted by others using deadly force. But he said officers have discretion in using their weapons.

“Each officer decides which tool to use based on the circumstances at hand,” said Case, who became chief in July.

He said the incident was recorded by officers’ body-worn cameras and the officers involved had not been interviewed as of Wednesday morning.

The shooting is the sixth since mid-May involving Anchorage police, four of which resulted in death.

The state Office of Special Prosecutions has declined to file charges in the two fatal shootings it has investigated so far, concluding that the use of force was justified. The office will investigate this latest shooting.

Case said the department will “continue to review our training, tactics and oversight of such incidents to try to prevent future officer-involved shootings.”