Firefighters battled a blaze that broke out at 1210 4th Ave. in the Inner Sunset this morning. 253 Lincoln Way was also affected by the fire. Read on for updates.

Breaking: Avoid 4th Ave and Lincoln in #SF. Working fire reported on top floor apt. bldg. Flames and smoke showing. Lincoln closed > area

— Breaking SF News (@breakingsfnews) December 29, 2015

Large fire at 4th and Lincoln. Please avoid the area.

— UCSF Police (@UCSF_Police) December 29, 2015

Fire 4th and Lincoln pic.twitter.com/z6i9amQFQz

— AnnaK (@akarydas) December 29, 2015

Huge house fire on Lincoln near 2nd. Hope everyone is okay! pic.twitter.com/EK2inotr6l

— colleen (@cleenr) December 29, 2015

Update, 11:08am: The fire may have started on the second floor and extended vertically from there, according to emergency personnel, who continue to battle the blaze. Heavy traffic is reported from 9th Avenue to Golden Gate Park. 

@sal_castaneda big fire on 4th avenue and lincoln pic.twitter.com/J7eWNHrpry

— gina (@mauberret) December 29, 2015

traffic is a bit of a s-show in the inner sunset due to a fire on Lincoln so be aware…the auto drivers are getting upset and swearing a lot

— G. Dewar (@njudah) December 29, 2015

Update, 11:20am: Good news: scanner chatter indicates that a cat has been recovered from the building and is in "viable" condition. No injuries or evacuations were reported. (Sad addendum: The Examiner reports that the cat, or a cat from the building, has died.)

Update, 11:38am: Firefighters are still inside the building, but the blaze was reported to be contained at 11:15am. One witness said that some of the building's residents could be seen outside, dressed in their pajamas and barefoot.