Commercial ships still sailing through the Red Sea are broadcasting messages about their nationality and even religion on their public tracking systems to avoid being targeted by Yemen's Houthis after deadly attacks this week by the militia.

A total of 10 crew members have been rescued so far after Yemeni militants sank a Greek-owned cargo ship in the Red Sea.

The cost of insuring commercial ships that sail past Yemen’s Houthi militants surged after the rebels sank two ships and killed sailors this week, underscoring how the attacks have revived risk in the crucial waterway.