A cargo ship came under attack Sunday off the coast of Yemen in the Red Sea, the British military said, the latest maritime attack off the conflict-torn Arab country.

The United Kingdom Maritime Trade Operations center reported the attack off the coastal city of Hodeida, which is under control of the Iranian-backed Houthi rebels.

The UKMTO said the ship reported being “under attack by unknown armed assailants” 30 nautical miles (55 kilometers) southwest of Hodeida, and that authorities were investigating.

No group immediately claimed the attack.

The Houthis have threatened to begin attacking ships again, though they have not been carrying out attacks.

The rebels previously fired drones and missiles at ships that pass by territory they control near the narrow Bab al-Mandab Strait at the southern end of the Red Sea. Their attacks over the course of the Gaza war forced shipping companies to reroute vessels around the southern tip of Africa instead of through the Suez Canal at the northern end of the Red Sea.

Somali pirates also have been active further away in the Gulf of Aden recently.

Suspected pirates attacked a vessel 76 nautical miles (140 kilometers) south of the port town of Balhaf in southeastern Yemen on July 1. Four armed men on a small craft caused minor damage to the ship’s bridge, according to the UKMTO.

– Agencies