The UN has condemned an air strike on a Yemeni detention centre, in which more than 80 people died and many hundreds were wounded.
Secretary General Antonio Guterres says the "escalation needs to stop".
The Saudi-led coalition said Houthi rebels in the country had not indicated the site should be protected from air strikes.
Yemen's Houthi Health Minister Taha-al-Motwakel has called for more international help:
"We consider this a war crime against humanity. The world should take its responsibility at this critical moment in human history. We are witnessing many victims."
