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BOULDER, Colo. (KDVR) — Boulder Fire-Rescue battled an apartment fire that started early Friday morning.

Flames were spotted from the apartment building around 4:53 a.m. at 2880 Kalmia Ave., near 28th Street and Diagonal Highway. Boulder Police Department and firefighters were able to evacuate everyone safely and no one was injured, BPD said.

Police said 24 units were involved in the fire, and the cause is under investigation. It is believed to have started on the upper floor as it spread quickly through the attic. Both the sprinkler system and smoke alarms activated, police said.

BPD’s drone team helped BFR with the incident by providing an aerial view with information and photos.

The American Red Cross is assisting displaced residents.