A 24-year-old woman who went swimming off Mile Rock Beach Friday evening was swept out by the current and her friends say they lost sight of her.

A group of three women were out at the beach, near Land's End and the Legion of Honor, around 8:15 p.m. Friday when one of the woman decided to go for a swim. As ABC 7 reports, the woman was fighting against the current and within minutes they couldn't see her anymore and called 911. A search and rescue effort then began, but it was called off around 10 p.m.

The search, by San Francisco Fire Department and Coast Guard crews, included boats, helicopters, and flashlights on shore.

According to the friends, the missing woman had some experience with swimming in rivers.

As KPIX/CBS SF reports, witnesses say they heard cries for help from the scene.

"These coastlines here are really dangerous," says SFFD Chief Glenn Kircher, speaking to KPIX. "These are some of the most dangerous beaches from the Golden Gate down to Pacifica. You're taking a great risk by getting in the water."