US airstrikes targeting an oil port held by Yemen’s Houthi rebels killed 74 people and wounded 171 others, the group said Friday, marking the single-deadliest known attack under President Donald Trump’s new campaign targeting the rebels.

Assessing the toll of Trump’s campaign, which began March 15, has been incredibly difficult as the US military’s Central Command so far has not released any information on the campaign, its specific targets and how many people have been killed, AP reports.

Meanwhile, Yemen’s Houthi rebels strictly control access to areas attacked and don’t publish information on the strikes, many of which likely have targeted military and security sites.

But the strike on the Ras Isa oil port, which sent massive fireballs shooting into the night sky, represented a major escalation for the American campaign. The Houthis immediately released graphic footage of those killed in the attack.

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In a statement, Central Command said that “US forces took action to eliminate this source of fuel for the Iran-backed Houthi terrorists and deprive them of illegal revenue that has funded Houthi efforts to terrorize the entire region for over 10 years.”

“This strike was not intended to harm the people of Yemen, who rightly want to throw off the yoke of Houthi subjugation and live peacefully,” it added. It did not acknowledge any casualties and declined to comment when asked by The Associated Press regarding civilians reportedly being killed.

The Iranian-backed Houthis later Friday launched a missile toward Israel that was intercepted, the Israeli military said. Sirens sounded in Tel Aviv and other areas.