This just in: the Castro Muni station is closed for rush hour traffic. The area is strewn with emergency vehicles. Muni claims to be running shuttle buses. Do-not-cross yellow police tape is up. Why? Well, according to @munialerts, it might have something to do with a dead body on the tracks.

@munialerts "Subway shut down at Castro. Cops everywhere. Rumor: dead body on tracks."

And:

@californiabeat: "TRANSIT ALERT: Systemwide delays on MUNI Metro after a train struck a pedestrian at the Castro St. Station"

Muni is setting up a bus bridge between West Portal and Embarcadero for riders.

Update 5:40: Muni, according to SF Appeal, is a shitstorm right now. If you can, please find alternative routes home.

Update 5:48 "Shuttles insanely packed. Recommend sharing a cab, buying a bike," reports munialerts.

Update 5:50: SFFD Spokesperson Lt. Mindy Talmadge confirms to SF Appeal that a pedestrian on the tracks was hit, killed by a Muni train.