A two-alarm fire started at a Mission District residence around 7 p.m. Friday, and spread to the building next door, but all residents were safely evacuated, with no injuries reported according to the SFFD. The fire was contained by 9 p.m.

This large fire on 20th Street displaced 22 people, including a child, according to KRON4.

The structure fire began in the second and third floors of a three-story, multi-unit building, as SFFD Captain Jonathan Baxter said in a video. The fire quickly escalated to two alarms as it spread to a similar three-story multi residential building next door. SFFD also said that two apartment buildings — 3011 and 3017 20th Street — have been “red-tagged” by authorities, meaning that they are not currently suitable for living.

Two-alarm fires require a high level of concern from firefighters and often involve multiple fire engines, and multiple-alarm fires bring higher levels of danger. SFFD said that they sent 75 SFFD staff, with assistance from SFPD and PG&E staff.

Officials added that they dispatched the Red Cross to provide aid for the residents who were displaced, according to the Chronicle.

Images and videos posted on social media by SFFD showed plumes of smoke across the sky during the fire, and aftermath including smoky walls and charred Bay windows at the buildings.

The fire officials are still unclear as to how the fire started, they said. They are currently investigating.

Photo via SFFD.