LOS ANGELES (AP) — Minutes before a gunman opened fire in a Los Angeles International Airport terminal last fall, killing a security screener and wounding three other people, the two armed officers assigned to the area left for breaks without informing a dispatcher as required.

The Los Angeles Airport Police Department officers were outside Terminal 3 when authorities say Paul Ciancia opened fire with an assault rifle, two law enforcement officials told The Associated Press. The officials requested anonymity, saying they were briefed on the shooting but were not authorized to speak publicly about the ongoing investigation.