The search for sailors missing after Yemen 's Houthis sank a ship in the Red Sea has ended, the private security firms involved said on Monday. At least four people are presumed dead and 11 remain unaccounted for.

Houthi attacks on a commercial vessel in the Red Sea follow Israeli strikes on Yemen's ports, heightening regional tensions.

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.