Fargo firefighters responded to a report of an activated fire alarm in an apartment building at 2:55 p.m. at 123 Roberts Street North. The building contains 62 apartments. On arrival, they found a fire in an apartment on the fourth floor. The fire was contained to a couch in an apartment by the building’s fire sprinkler system. The fire created heavy smoke on the fourth floor; moderate smoke on the third and fifth floors; and, light smoke on the second floor. Because of the couch’s placement in the apartment, the fire caused two sprinkler heads to activate. The fire was extinguished by the sprinkler heads as the crew arrived at the apartment. There was water that needed to be cleaned up on the fourth, third, and second floors. The cause of the fire is under investigation. Damage is estimated to be approximately $1500.00. There was minor fire damage in one unit, which was limited to the immediate area around a couch. There were no firefighter or civilian injuries. The one tenant in the apartment will not be able to stay in the apartment until it is cleaned.