US and British naval forces shot down 21 drones and missiles fired by Yemen-based Houthis on Tuesday towards the southern Red Sea, the United States said, with Britain hinting at further measures to protect international shipping lanes.
British Defense Secretary Grant Shapps said it was the largest attack in the area by the militants to date as the three-month-long war between Israel and Hamas in Gaza spills over into other parts of the Middle East.
"This is an unsustainable situation," Shapps told reporters, adding "watch this space" with regards to further possible action by Britain and its international partners.
"This cannot continue and cannot be allowed to continue."
US Central Command said no injuries nor damage were reported, adding that this was the 26th Houthi attack on commercial shipping lanes in the Red Sea since Nov. 19.
Later in the day, Houthi military spokesperson Yahya Saree said the Iranian-backed militants fired a large number of ballistic and naval missiles and drones at a US ship that was "providing support" to Israel.
In a televised speech, Saree did not say when the Houthi strike had occurred or what damage, if any, the vessel had suffered, but that the operation was a "preliminary response" to a previous US attack that killed 10 Houthi fighters.
The US Fifth Fleet, which is based in the Gulf region and has along with Britain deployed naval forces to protect Red Sea shipping from an upsurge in Houthi attacks, did not immediately respond to a request for comment.
It was not clear whether the missile and drone salvo against the US ship reported by the Houthi official had anything to do with the US and British naval action.
Houthis attacks distributed international commerce
The Houthis, who control most of Yemen, have been targeting Red Sea shipping routes to show their support for Hamas, a Palestinian Islamist group. Germany's foreign ministry said the latest attacks were a "clear escalation."
The attacks have seriously disrupted international commerce on the key route between Europe and Asia that accounts for about 15% of the world's shipping traffic.
Many shipping companies have been forced to reroute vessels, taking the longer journey around Africa, although several oil majors, refiners and trading houses have continued to use it.
US Central Command said 18 drones, two anti-ship cruise missiles and one anti-ship ballistic missile were shot down by the two navies in the incident on Tuesday.
Shapps said that Royal Navy ship HMS Diamond, which repelled the attacks along with US warships, may have been specifically targeted, adding there was also "a generalized attack on all shipping."
The Houthis have vowed to continue attacks until Israel halts the conflict in Gaza, and warned they would attack US warships if the militia group itself was targeted.
German shipping group Hapag Lloyd said on Tuesday it would continue to avoid the Suez Canal and around the Cape of Good Hope for security reasons, while its Danish rival Maersk has said it would avoid the route "for the foreseeable future."
Retailers across the world have also been stocking up on goods before China's Lunar New Year holiday and seeking air or rail alternatives to avoid empty shelves this spring.