The cause of a 2-alarm fire on Sunday that resulted in extensive damage to a building on Green Street in the South End remains under investigation, Woburn Fire Chief Timothy Ring said this morning. The fire broke out in an office in a multi-tenant commercial building at 3 Green St., shortly after noon yesterday, while Blessed of the Lord Church was in session. Congregants apparently notified the Woburn Fire Dept. of the fire.  There were no injuries reported. Everyone managed to exit the church without incident, according to Ring.

The two other businesses in the building are RSK Marble & Granite and Woburn Bottle & Can recycling facility. Areas of the building sustained significant damage, Ring said.

“The fire got up into the roof, so we had to peel back the roof to get at it,” said Ring. “The fire also set off the sprinkler system, so there was a lot of water damage, as well as smoke and fire damage.”

Departments from Winchester, Stoneham, Medford and Arlington provided mutual aid at the scene. The fire was brought under control within about two hours, and crews cleared the scene by 5 p.m. on Sunday.

The State Fire Marshal’s office and the Woburn Fire Cause Determination Unit are conducting the investigation. Traffic along Green Street was disrupted while crews fought the fire.