Rescuers found four more crew members Thursday who went missing after Yemen’s Houthi rebels sank a ship in the Red Sea as the United States alleged the group may “have kidnapped” others on board.

Six crew members have been rescued and at least three others killed after a cargo ship was attacked by Yemen's Houthis and sank in the Red Sea, a European naval mission says.

Rescuers launched a search Wednesday for survivors of a Liberian-flagged cargo ship that came under attack from Yemen's Houthi rebels in the Red Sea, authorities said.