Police and fire are on the scene, as well as Coast Guard helicopters.
A witness on the scene is reporting she saw young people wearing blankets who appeared to have been rescued from the water.
Stay with ABC7 News for the latest details on this developing story.
This is the staging area for people getting treated after a boat capsized in SF Bay during #FleetWeek festivities. pic.twitter.com/nSSRrmhfcD
— Sergio Quintana (@svqjournalist) October 9, 2016
#SF firefighters are on the scene near #Pier45 after a boat carrying about 30 juveniles capsized. https://t.co/p8ywDUORDo pic.twitter.com/gJoVBbKg4Z
— ABC7 News (@abc7newsbayarea) October 9, 2016
PIER 45 BOAT CAPSIZED WITH ABOUT 30 JUV ON BOAT SOME ARE TRAPPED UNDER THE HULL. USCG BOAT/HELIO/DIVERS EN ROUTE. pic.twitter.com/KnEKFVgpjx
— San Francisco Fire (@sffdpio) October 8, 2016
Capsized boat in #SF bay. Rescue efforts underway pic.twitter.com/RDeug5JxCp
— Lisa Amin Gulezian (@LisaAminABC7) October 9, 2016