(CNN) At least three people were missing and 13 others sent to hospitals Friday after apparently being dumped from a boat off the coast of San Diego, authorities say.

The rescued group was being smuggled into the US from Mexico, according to the US Customs and Border Patrol

Emergency crews responded to calls of people yelling in the water early Friday morning, Encinitas Fire Chief Mike Stein said.

Three people were pulled from the ocean and another 10 reached the shore on their own, according to Stein. The 13 people were taken to local hospitals for treatment of mild hypothermia, deputy fire chief Robert Ford said.

The survvors included a 15-year-old girl, 13- and 15-year-old boys, two women and eight men, CBP reported.

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