Two ships, including one heading to India from the US, travelling in West Asian waters were attacked by suspected Yemen Houthi rebel drones early on Tuesday, authorities said, the latest assaults in the Iranian-backed fighters’ campaign of targeting vessels over Israel’s war on Hamas in the Gaza Strip.

The first attack happened in the southern part of the Red Sea, west of the Yemeni port of Hodeida, with the projectile causing “slight damage” to the vessel’s windows on the bridge, the British military’s United Kingdom Maritime Trade Operations said. A small vessel had been nearby the ship before the attack, it added.

The private security firm Ambrey identified the vessel as a Barbados-flagged, UK-owned cargo ship. No one was hurt onboard the vessel, which suffered “minor damage”, the firm said.

A second ship came under attack later Tuesday off Yemen’s southern port city of Aden, the UKMTO reported. Ambrey identified it as a Marshall Islands-flagged, Greek-owned vessel coming from the US heading to India. “The vessel reported an explosion 50 metres off its starboard side,” Ambrey said. “No injuries or damage were reported.”

Later, a military spokesman of the Iranian-backed Houthi rebels, Brigadier General Yahya Saree, claimed in a statement that the rebel forces attacked two separate vessels, one American and one British, in the Red Sea. He provided no evidence to support the claim.

The Houthis made no claim about the attack off the coast of Aden.

One of the ships the Houthis claimed they attacked — the Morning Tide — matched details provided by Ambrey. Tracking data showed it to be in the Red Sea near the reported attack.

The Morning Tide’s owner, British firm Furadino Shipping, told The Associated Press no one was hurt in the attack and the ship was continuing onward to Singapore.

Since November, the rebels have repeatedly targeted ships in the Red Sea over Israel’s offensive in Gaza against Hamas. But they have frequently targeted vessels with tenuous or no clear links to Israel, imperiling shipping in a key route for trade among Asia, West Asia and Europe.

In recent weeks, the US and the UK, backed by other allies, have launched airstrikes targeting Houthi missile arsenals and launch sites for its attacks.

The US and Britain struck 36 Houthi targets in Yemen on Saturday. An air assault on Friday in Iraq and Syria targeted other Iranian-backed militias and the Iranian Revolutionary Guard.