Former SFister Dianne de Guzman sent word about a block shutdown this morning. "Firefighter activity at Mission near Ocean. The block is shut down. About 3-4 trucks. No visible flames. Firefighters on roof with axes. Couldn't see which business they were on."

You might find serious delays on the 14 Muni line.

So, stay away from Mission and Ocean streets this morning if you can help it.