The Houthi militia, which is backed by Iran, said the attack was an American strike. The U.S. Defense Department said it was assessing the claims and took them seriously.

Graphic footage aired by the Houthis’ al-Masirah satellite news channel showed what appeared to be dead bodies and others wounded at the site.

Yemen’s Houthi rebels on Monday alleged a US airstrike hit a prison holding African migrants, killing at least 68 people and wounding 47 others. The US military had no immediate comment.