Update: SFPD says they have detained the man involved.
San Francisco police have descended upon the Bayview where an armed robbery suspect has barricaded himself inside a building.
The story is unfolding as we type, so details are scarce right now. However, Officer Albie Esparza tells us the cops are at the 1300 block of Hudson Street where they're setting up a perimeter and calling for a shelter in place.
Nobody has been evacuated at this time. We'll tell you more when we know more.