A small apartment fire at an Edison building early Sunday morning prompted the evacuation of numerous residents, keeping firefighters on scene for three hours, the Edison Fire Department said.

Fire crews responded to 1 Roosevelt Drive around 1:30 a.m., after receiving a fire alarm and multiple calls from residents reporting smoke on the fourth floor of a building.

Upon arrival, firefighters encountered smoke conditions and activated sprinklers on the fourth floor. A small fire in one of the apartments had been extinguished before crews arrived, likely by the building’s sprinkler system, the fire department said.

As a precautionary measure, numerous residents were evacuated from the building during the incident.

Fire companies remained on scene conducting ventilation, cleanup, and safety checks until approximately 4:30 a.m.