As many as four people were tossed into the water "and one person was clinging to a bridge" after boat collision near the Richmond bridge. The crash happened just after midnight. "So far, nothing has been found and the caller hasn't been tracked down either," reports KGO, adding that "the search involved a helicopter, and at least half a dozen boats, but has been scaled back this morning."

No word yet on the whereabouts of the passengers. We'll update as soon as we know more.