The search for those missing after Yemen's Houthi rebels sank a ship in the Red Sea has ended as at least four people are presumed dead and 11 others remain unaccounted for, the private security firms involved said Monday.

The fact that so many countries in the region did not assist the ships quickly in order to deter the Houthis shows that it is not a priority. The Iranian-backed Houthis are emboldened after sinking two ships last week in the Red Sea.

Ten crew members rescued after Yemen's Houthi rebels sank a Greek-owned ship last week have arrived in Saudi Arabia, Reuters quoted maritime security sources as saying. Private security companies said earlier that the search for the remaining crew had been called off,