A Saudi-led coalition air strike on a prison in southwest Yemen killed at least 100 people, an official from the International Committee of the Red Cross (ICRC) said on Sunday.
Franz Rauchenstein, head of the ICRC delegation in Yemen, told Reuters by telephone after visiting the site that bodies were still being pulled from the rubble at the prison in Dhamar.
The coalition, which has been battling the Iran-aligned Houthi movement in Yemen for more than four years, said it hit a Houthi site storing drones and missiles.
Houthi officials and residents said the air strike targeted a complex used as a detention centre in the city.
Saudi-led coalition says it bombed Houthi arms site
The Sunni Muslim coalition, which has been battling the Iran-aligned Houthi movement for more than four years in Yemen, said in a statement carried on Saudi state television that it destroyed a site storing drones and missiles in Dhamar.
The Western-backed alliance intervened in Yemen in March 2015 against the Houthis after they ousted the internationally recognised government from power in the capital, Sanaa, in late 2014.
The movement, which holds most major population centres in the Arabian peninsula nation, has stepped up cross-border missile and drone attacks on Saudi Arabia in recent months. The Saudi-led alliance has responded with strikes on Houthi targets.
The coalition, which has come under criticism by international rights groups for air strikes that have killed civilians, said it had taken measures to protect civilians in Dhamar and the assault complied with international law.
The United Nations is trying to ease tension in Yemen to prepare for political negotiations to end the war that has killed tens of thousands and pushed the long-impoverished country to the brink of famine.
The conflict is widely seen in the region as a proxy war between Saudi Arabia and Iran. The Houthis, who deny being puppets of Tehran, say they are fighting a corrupt system.