The Coast Guard doesn't know who was on a sailboat missing off the coast of San Francisco or even where they were headed.
The last thing rescue teams heard on Sunday afternoon was a firmly stated, but calm sounding radio message:
"Coast Guard, Coast Guard we are abandoning ship. This is the Charm Blow we are abandoning ship."
Before sending that message, the man said their 29-foot sailboat was taking on water.
UPDATE: The Coast Guard suspended their search for survivors Tuesday saying that distress call may have been a hoax.
Officials say there's no other evidence something went wrong.
They had believed a family of four included a 4-year-old boy and a cousin younger than eight were on board.
Several aircraft and other boats searched but found nothing.
Video: Searching for a family lost at sea
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