A fire broke out on the roof of a West End apartment building Tuesday afternoon, burning some wooden decking, a D.C. Fire and EMS official said.

Firefighters received a call for the “relatively small fire” on the roof of the 1221 West End Residences building, near 24 and M streets, at about 4:45 p.m., Deputy Fire Chief Kevin Byrne said. At about 5:35 p.m., he said firefighters contained the flames. There were no injuries.

The fire originated around an air conditioning unit, Pete Piringer, the department’s spokesman, said. Investigators have yet to determine whether or not the unit sparked the fire.

Five fire engines, three trucks and three chiefs responded to the scene, Byrne said, adding that they plan to stay on site for another hour.