UPDATE: 1 Dead In Early Morning 2-Alarm San Francisco Fire

SAN FRANCISCO (CBS SF) -- An intense blaze erupted on the third floor of a building in San Francisco's Cole Valley neighborhood early Wednesday, claiming the life of one of the residents.

UPDATE: San Francisco Man Who Died in Fatal Cole Valley Fire Identified

San Francisco fire officials tweeted that crews were responding to a 1-alarm fire at 1130 Shrader Street shortly after 6 a.m.

Social media video showed billowing flames and smoke engulfing the third floor and the roof of the Victorian as crews arrived on the scene.

Firefighters called a second alarm because of the challenges they faced in the densely packed neighborhood.

"We have the hills, the slopes and the powerlines here. We also had 30 mile-per-hour gusting winds," said SFFD Lt. Jonathan Baxter.

Firefighters were able to pull a resident from the burning building, but crews were unable to revive the male victim, who died at the scene.

Neighbors told KPIX the man who passed away had Parkinson's Disease, making it more difficult for him to get out.

"When I saw it, I knew that Tony lived alone and I knew he had mobility issues...so I was nervous," said a neighbor who did not want to be identified. "And to see his beautiful house go up in flames...horrified."

When firefighters arrived, they said they heard no audible alarms. No other injuries were reported.

Police shut down the intersection of Grattan Street and Cole Street and halted traffic on Parnassus Avenue to allow firefighters to mop-up the blaze. The fire was contained by 7 a.m.

A cause of the fire was under investigation.