SAN FRANCISCO (KRON) — Firefighters have gained control of a two-alarm fire Thursday morning in San Francisco, according to officials.

A woman was badly burned in the two-alarm fire in a condominium in San Francisco’s Forest Knolls neighborhood Thursday morning, according to residents.

The fire was reported at 8:10 a.m. in the 600 block of Clarendon Avenue at a single family residence.

The fire was in a three-story, three-bedroom unit at 622 Clarendon Ave., according to fire officials.

Fire officials tweeted that one person was rescued from the fire. They suffered critical burns and are being treated by paramedics.

Fire department spokesman Jonathan Baxter said firefighters rescued one adult victim from inside the condo who was transported to Saint Francisco Memorial Hospital’s burn center in critical condition.

Residents of the complex said the victim was a woman who lived in the unit with the homeowner and that they understood she had been left badly burned and possibly unconscious.

The homeowner was at work when the fire broke out but returned home when it was reported before going to the hospital to check on the victim, they said.

Resident Donna Boston, who has lived in the 45-unit gated complex since it was built in 1976, said she called 911 around 8:10 a.m. and was told several other people had already called to report the fire, which appears to have been in the back of the unit.

“We opened the drapes and saw the flames leaping out the back window,” Boston said.

Baxter said the rescue was dangerous for fire crews, with one firefighter having his entire leg go through a floor in the condo. He was able to get his leg free and was not injured.

The blaze was declared under control at 8:37 a.m. but not before it spread to two adjacent units, causing minor damage, Baxter said.

Resident David Wierzba, who lives next door to the unit where the fire started, said his unit smelled like smoke but was otherwise in good shape.

Firefighters had to break through the wall of another adjacent unit to fight the fire, however, and the damage seemed extensive, Wierzba said.

“It’s a mess on the back side of the unit,” he said.

Judy Clarke, president of the complex’s homeowners association, said it is very quiet and safe, and units do not come up for sale very often.

The last fire was more than 10 years ago, she said.

Baxter said investigators have not yet determined how many people lived inside the building where the fire started and the cause is under investigation.