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Updated at 3 p.m.

Six people were injured and at least 37 others displaced when a four-alarm fire scorched two buildings at the corner of Valencia Street and Duboce Avenue.

The number of displaced residents could increase, the AP reports.

Five firefighters and one resident were injured. None of the injuries were life-threatening, and all were taken to San Francisco General Hospital. Three of the firefighters were injured when a staircase collapsed.

Firefighters received a call reporting a fire at 101-109 Duboce Ave. at 9:51 a.m., said Officer Mark Gonzales of the San Francisco Fire Department.

The blue three-story residential building, built in 1911, was a total loss, Gonzales said. At first the blaze was designated a two-alarm fire, he said, but it quickly escalated to four alarms.

The cause is still under investigation. Some neighbors reported hearing a loud explosion and people shouting “Get out!” It is not clear if the explosion preceded the fire.

The fire then spread to an adjacent building, 204-208 Valencia St., but the damage there was limited to a couple of units, according to the building’s owner.

About a hundred people were gathered outside of the building at 10:40 a.m., some talking to the Red Cross. An evacuation center has been set up at the nearby Bahai Center, and about 20 to 25 people are there, said Steven Sharp, public affairs lead for the American Red Cross.

While the fire appeared to be under control at 11:30 a.m., firefighters were still on the scene at 1 p.m., some on the roofs of nearby buildings.

Witnesses said they watched firefighters escort at least one resident out of the building. She appeared to be fine, however.

Sulton Alkhrarsa, the owner of 204-208 Valencia, carried his mother away from one of the units.

“I went upstairs and I carried my mom down. My mom is diabetic, 65 — she is sick, so I moved her out fast, so no problem,” he said. “Everyone in the building is safe, so don’t worry about that.”

Update: AP is reporting the number of displaced has increased to 37.

Update: The Examiner is reporting that five firefighters and one resident were injured in today’s four-alarm fire.

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Correction: an earlier version of this article had the incorrect spelling for Sulton Alkhrarsa.