Rescue crews are searching for a person in distress in the waters off the south side of Ocean Beach, according to the San Francisco Fire Department.
The victim was initially thought to be a surfer, firefighters said, but surfers at the scene have told them he's fully clothed.
Emergency crews are asking people to avoid the area near the Great Highway and Sloat Boulevard while the search and rescue operation is in progress.
#101917SR1 UPDATE SFFD and @USCG rescue teams searching for the reported male last seen an hour ago off Ocean Beach in distress AVOID AREA pic.twitter.com/woPRTMiylx
— San Francisco Fire (@sffdpio) October 19, 2017