Two adults, two children missing off coast of San Francisco: Boat possibly named 'Charmblow'

(CNN) -- Authorities are searching for two adults and two young children missing off the coast of San Francisco after their 29-foot sailboat took on water, the Coast Guard said late Sunday.

The vessel, possibly named Charmblow, was about 65 miles (105 kilometers) off the coast of Pillar Point when someone on board radioed the Coast Guard at 4:20 p.m. The caller said the boat was taking on water and the vessel's electronics were failing, the Coast Guard said.

About an hour later, the boat operator said the occupants were abandoning the vessel, and the Coast Guard lost communication with the boat.

The crew might have boarded a life raft, the Coast Guard said.

Several aircraft and vessels have joined the search for the boat's occupants, which include two children under the age of 8, the Coast Guard said.