Union Square in downtown
Photos from the scene show
The one-block radius surrounding Union Square has also been blocked off, the Associated Press $4. Cable cars in the area are not running.
The suspicious package was called in shortly before noon.
ABC San Francisco reporter Juan Carlos Guerrero tweeted this photo from the scene:
Cable Car service stopped around Union Square. Nike Marathon runners can't pick up race packets. $4
- Juan Carlos Guerrero (@JuanCarlosABC7) $4