A major blaze broke out Tuesday morning around 6 a.m. that sent flames into the sky on Octavia Boulevard, threatening neighboring buildings and disrupting the morning commute for some in San Francisco.

The fire occurred at a residential building under construction at the corner of Octavia Boulevard and Oak Street, and by 6:12 a.m. a second alarm had been called. The blaze would grow to four alarms very quickly, as wood framing and construction material fueled a hot and fast fire, and sirens wailed throughout nearby neighborhoods.

The building would soon partially collapse, and threats to four neighboring buildings led to evacuations. According to the Citizen app, a hot spot had to be extinguished as far away as Gough Street.

Four-Alarm Structure Fire in Hayes Valley @CitizenApp

Oak St & Octavia St 6:00:11 AM PDT

Update: The SFFD has confirmed that five buildings were affected by this fire, though no one was injured. Eight people residing in nearby buildings have been displaced as a result of the fire.

As of 7 a.m., residents and drivers were still being told by the SF Fire Department to avoid the area, and the fire was still active.

The property in question is one of multiple development sites that were created by the removal of the Central Freeway overpass and Fell Street off-ramp over a decade ago, when this stretch of Octavia Boulevard was created. A handful of these sites have been fully developed into housing, but several, including the parcel that the Proxy pop-ups and Biergarten sit on, still remain to be developed.