A panga boat carrying 15 illegal immigrants flipped in heavy surf along Crystal Cove early Tuesday morning and ejected all the occupants, federal immigration authorities said.
All but two aboard were detained and there were no serious injuries or deaths, officials said.
The incident was reported around 5 a.m., said Virginia Kice, a spokeswoman for Immigration and Customs Enforcement.
The nationalities of those detained were not immediately available because they were still being questioned by federal agents, Kice said. A search of the area did not turn up the boat's other two occupants, who authorities believe fled the scene.
The incident comes a day after 15 immigrants from Mexico were rescued from Santa Cruz Island, where authorities said they were believed to have been abandoned by a smuggler.
Kice noted that the boats being used by the new breed of maritime smugglers are not designed for lengthy, deep-water trips, and as a consequence were putting illegal immigrants in peril.