Six crew members have been rescued from a Liberian-flagged cargo ship in the Red Sea, according to a European Union naval force, after an attack claimed by Yemen’s Houthi rebels.

The assault, which sank the Greek-owned vessel on Wednesday, also killed at least four sailors and left 15 others missing, the Reuters news agency reported, citing maritime officials.

The Houthis said the attack on the Eternity C had been conducted on Monday using an unmanned boat and missiles, and was carried out in solidarity with Palestinians in Gaza, to pressure the Israeli military to end its assault on the besieged enclave.

The group’s military spokesperson, Yahya Saree, said that the Eternity C had been headed towards Israel, and that the Houthis had also “responded to rescue a number of the ship’s crew, provide them with medical care, and transport them to a safe location”.

The rebels released a video they said depicted their attack on Eternity C. It included a call for the crew to evacuate and showed explosions on the ship before it sank.