Yemen's Houthi rebel group has claimed that a US air strike hit a prison holding African migrants, killing at least 68 people and wounding 47 others.
Graphic footage aired by the Houthi-aligned al-Masirah satellite news channel showed what appeared to be dead bodies and others wounded at the site.
The Houthi-run Interior Ministry said some 115 migrants had been detained at the site.
Footage from the site analysed by the Associated Press suggested some kind of explosion took place there, with cement walls seemingly peppered by debris fragments.
The strike in Yemen's Saada governorate, a Houthi stronghold, is the latest incident in the country's decade-long war to see African migrants from Ethiopia and other nations killed while attempting to cross Yemen for a chance to work in neighbouring Saudi Arabia.
The Houthi rebels allegedly make tens of thousands of dollars a week smuggling migrants over the Saudi border.
Migrants from Ethiopia have found themselves detained, abused and even killed in Saudi Arabia and Yemen during the war.
A 3 October 2022 letter to the kingdom from the UN said its investigators "received concerning allegations of cross-border artillery shelling and small arms fire allegedly by Saudi security forces, causing the deaths of up to 430 and injuring 650 migrants".
Saudi Arabia has denied killing migrants.
The US strikes will also likely renew questions from activists about the US aerial campaign, known as "Operation Rough Rider". which has been targeting the rebels as the Trump administration negotiates with their main benefactor, Iran, over Tehran's rapidly advancing nuclear programme.
The strikes have drawn controversy in America since Defence Secretary Pete Hegseth and other officials were revealed to be using the commercial Signal messaging app to post sensitive details about the attacks, some of which were seen by a journalist who was inadvertently added to a group.
"To preserve operational security, we have intentionally limited disclosing details of our ongoing or future operations," Central Command said.
"We are very deliberate in our operational approach, but will not reveal specifics about what we’ve done or what we will do."
It did not immediately respond to questions about the alleged strike in Saada.
Overnight air strikes
Meanwhile, US air strikes overnight into Monday targeting Yemen's capital killed at least eight people, the Houthis said.
The American military acknowledged carrying out more than 800 individual strikes in their monthlong campaign.
The overnight statement from Central Command also said Operation Rough Rider had "killed hundreds of Houthi fighters and numerous Houthi leaders", including those associated with its missile and drone program.
It did not identify any of those officials.
"Iran undoubtedly continues to provide support to the Houthis," the statement said. "The Houthis can only continue to attack our forces with the backing of the Iranian regime."
"We will continue to ratchet up the pressure until the objective is met, which remains the restoration of freedom of navigation and American deterrence in the region," it added.
The US is targeting the Houthis because of the group's attacks on shipping in the Red Sea, a crucial global trade route, and on Israel.
The Houthis are also the last militant group in Iran's self-styled "Axis of Resistance" that is capable of regularly attacking Israel.
