This is not what you want to see outside at 4:30 am when awakened by wailing sirens.
San Francisco's characteristic wood back porches and stairs can go up like a torch.
Fire trucks filled the intersection.
Firefighters massed to go in.
Some climbed over the top.
Neighbors huddled on the street could just make out the firefighters' lights as they searched the building and broke out windows to release the smoke.
Not all residents came out under their own power.
I do not know yet how many were injured, burned and made homeless tonight in my corner of the world. I am sobered and sombre this morning.
UPDATE: The Chronicle reports 4 people were seriously injured in the fire. They say the building housed 20 people.