HONOLULU (KHON2) -- Honolulu Fire Department (HFD) crews responded to a structure fire early Monday morning at 60 North Nimitz Highway after a 911 call came in at 1:36 a.m. Get Hawaii's latest morning news delivered to your inbox, sign up for News 2 You Six fire units and about 26 personnel were on the scene, with the first crew arriving at 1:43 a.m. When firefighters entered the apartment, they found that a sprinkler had already activated, keeping the fire contained to the kitchen. High Surf Warning extended for Kauai and Niihau through Jan. 8 Crews used a water extinguisher to fully put out the flames by 1:53 a.m. After shutting off the sprinkler, they searched the apartment to make sure no one was inside. The HFD’s Fire Investigator was called in to investigate. Fire damage estimates have not been made. Download the free KHON2 app for iOS or Android to stay informed on the latest news HFD concluded operations with no reports of injuries.