(Bloomberg) -- The US accused Iran of being behind an attack on a tanker in the Indian Ocean as the threat to shipping triggered by Israel’s war with Hamas spread beyond the Red Sea. 

Iran fired a one-way drone that struck the Chem Pluto — a Liberia-flagged, Japanese-owned and Netherlands-operated chemical tanker — on Saturday about 200 nautical miles from the coast of India, according to a Pentagon statement. There were no casualties. 

The latest accusations are increasing tensions with Iran, which the US has previously blamed for being behind a series of attacks on ships in the Red Sea by Houthi militants in Yemen. Those attacks, which the Houthis say will continue until Israel ends the war in Gaza, have caused chaos in an area that accounts for some 12% of global maritime trade. 

The world’s major container and oil shippers have been rerouting vessels away from the waterway, with the strikes roiling shipping markets and pushing up oil prices across the world. They have also prompted the US to form a naval coalition to protect traffic in the Red Sea.

Read more: US Says Red Sea Patrol Will Be Able to Thwart Houthi Attacks 

The White House, citing newly released intelligence, said on Friday that Iran was “deeply involved” in the planning of the Houthi attacks and has supplied weapons, financial support and training. Iran’s Foreign Minister Hossein Amir-Abdollahian denied that his country is helping the Houthi rebels, but threatened that the waterway won’t be safe as long as Israel maintains its offensive in Gaza.

“The accusation is baseless,” Amir-Abdollahian said in a news conference in Tehran cited by state television Saturday. The attacks are “a completely Yemeni decision in support and defense of Gaza,” he said. 

Read more: Iran Dismisses US Intelligence Tying It to Red Sea Attacks

UK Foreign Secretary David Cameron has joined the US in accusing Tehran of organizing Houthis’ attacks on commercial vessels in the Red Sea and for the subsequent major disruption to supply chains across Europe. He described the Houthis as an Iranian “proxy” alongside Hamas, Hezbollah and militias in Iraq. 

“Iran is a thoroughly malign influence in the region and in the world. There’s no doubt about that. You’ve got the Houthis, you’ve got Hezbollah, you’ve got the Iranian-backed militias in Iraq that have actually been attacking British and American bases, troops. And, of course, Hamas,” he said in an interview published Sunday.

Meanwhile, Iran’s military revealed a range of new equipment in a state television report Sunday, highlighting new cruise missiles with a range of up to 1,000 kilometers, drones with “electronic warfare and intelligence” capabilities and helicopters for reconnaissance and assault.

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