The US military on Tuesday carried out a new strike in Yemen against four Houthi anti-ship ballistic missiles, two US officials told Reuters, the latest move against the Iran-aligned group over its targeting of Red Sea shipping.

One of the officials said the missiles were struck because they were being prepared to target ships in the region. The US strike came a day after Houthi forces hit the US-owned and operated dry bulk ship Gibraltar Eagle with an anti-ship ballistic missile.

Houthi attacks on Red Sea shipping have continued even after the US and Britain last week launched an initial wave of strikes to degrade Houthi capabilities.

The Houthis, who control the most populous parts of Yemen, have claimed their attacks on commercial ships are aimed at supporting the Palestinians in Israel’s war in Gaza. Their attacks have disrupted global shipping and stoked fears of global inflation. They have also deepened concern that fallout from the Israel-Hamas war could destabilise West Asia.

The Houthi movement has vowed to keep up attacks despite the strikes last week against radar and missile capabilities. Some experts believe they welcome a conflict with the US and its allies.

A Malta-flagged, Greek-owned bulk carrier was targeted and hit by a missile while northbound in the Red Sea, 122 nautical km northwest of the Yemeni port of Saleef, a security firm said on Tuesday.

On Monday, the Gibraltar Eagle’s US-based operator Eagle Bulk Shipping said it was hit by an “unidentified projectile” while sailing 160 km off the Gulf of Aden. The attack caused a fire in a hold of the vessel, which was carrying steel products, but no injuries and the ship was continuing on its way, it said.

Container vessels have been pausing from the Red Sea that leads to the Suez Canal, the fastest freight route from Asia to Europe.