STOCKTON —Two firefighters were injured in a five-alarm blaze Thursday night at East Flora and Pilgrim streets in downtown Stockton that spread to other structures in the area and sent smoke over downtown Stockton, authorities said late Thursday night.

According to Stockton Fire Department spokesman Jeff Whitlock, one engine responded to a mattress fire at Flora Street just after 9 p.m.

“Upon arrival, the crew encountered heavy fire in an open area, about 100 feet by 100 feet, with in excess of 400 mattresses all on fire,” Whitlock said. “It caused significant damage to a warehouse just south of the location, as well as several homes east of the location.”

Because of the severity of the wind in the area, Whitlock said, some of the homes were starting to catch fire. At that point, the fire was escalated to a five-alarm fire.

Whitlock said crews worked rapidly to minimize the damage to the surrounding homes. The roof of a house about a block away was also affected from embers in the air, he said, but crews worked quickly to extinguish that as well.

Two firefighters were admitted to local hospitals with minor injuries. No injuries were reported to civilians, Whitlock said.

“We were able to evacuate everyone in a timely fashion,” Whitlock said.

Whitlock said he did not receive the numbers on how many were affected. He did say that the Red Cross was on scene assisting with those evacuated.

Around 11 p.m., the fire department reported they had the fire under control. Firefighters remained at the scene, and Stockton police were providing traffic control and advising people to avoid the area. They said power was out for at least 500 customers in the area

The cause of the initial fire was not immediately known, Whitlock said, but fire investigators were actively working to find a cause.

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