The US on Friday released newly declassified intelligence that suggests Iran has been “deeply involved in planning the operations against commercial vessels in the Red Sea,” National Security Council spokesperson Adrienne Watson told CNN.

The Iran-backed Houthi rebels have launched more than 100 attacks against about a dozen commercial and merchant ships transiting the Red Sea over the past four weeks, CNN previously reported. The newly declassified intelligence suggests that “Iranian support throughout the Gaza crisis has enabled the Houthis to launch attacks against Israel and maritime targets, though Iran has often deferred operational decision-making authority to the Houthis,” Watson said.

On Tuesday, a senior US military official said the Iranians are operating in the Red Sea when asked whether Iran is helping the Houthis select targets. But that official said the Houthi attacks have been broadly indiscriminate.