Firefighters knocked down a two-alarm fire this morning at a strip mall in San Jose, according to a San Jose Fire Department spokesman. At 3:18 a.m., fire crews responded to the blaze at a strip mall at 2455 Alvin Ave. At the scene firefighters found smoke coming from the roof, according to fire Capt. Brad Cloutier. At 3:31 a.m., the blaze was upgraded to two-alarms. Firefighters continued their attack on the fire, which was quickly knocked down. Coutier said no one was in the building when the fire broke out and there were no injuries to firefighters. The fire caused some damage to the building’s attic and the sprinkler system that was activated by the blaze, Cloutier said. Cloutier said that some businesses in the mall will probably have to be closed today due to the damage, and fire officials are working this morning to contact business owners. Crews will remain on the scene this morning to ensure hot spots are out, and traffic in the area might be affected, Cloutier said.