Three people were killed, four were injured and seven others are missing after a small boat overturned early Monday in the ocean off San Diego, sheriff’s officials said.

At least three people are dead and nine other people remain unaccounted for, including two children, U.S. Coast Guard spokesperson Hunter Schnabel told USA TODAY. Crews responded to a report of an overturned vessel on the shores of Torrey Pines State Beach off the coast of Del Mar shortly after 6:30 a.m. local time, officials told KABC-TV.

At least three people were killed when a boat overturned near San Diego on Monday as the Coast Guard, lifeguards and sheriff's deputies launched a search for more victims, authorities said. The travelers appeared to be migrants, officials said. The exact number of people on board wasn't immediately clear.