The Saudi-led military coalition has announced it will investigate an air strike in Yemen which killed at least 29 children.
On its Twitter feed, Saudi-funded Al-Arabiya TV quoted a senior official who said the coalition was probing "collateral damage" from the strike.
Forces struck a bus in Dahyan in the rebel-held province of Saada.
The coalition backs Yemen's government against the Houthi rebels and initially deemed its actions "legitimate".
But now the coalition intends to investigate the strike, with Al-Arabiya TV quoting the official as saying they will "bring the perpetrators to account and compensate the victims".
The Houthi-affiliated health ministry now says the death toll from the strike has risen to 51 in total, including 40 children, with a further 79 injured.
UN Secretary-General Antonio Guterres has called for an "independent and prompt investigation" into the strike, his spokesperson said.
What happened in Saada?
The bus was hit as it passed through Dahyan market, transporting local civilians, including many schoolchildren, Yemeni tribal elders told the Associated Press news agency.
The children were on their way back to school from a picnic when the driver of their bus stopped to get a drink, the charity Save the Children said it had been told by its staff.
The vehicle was stationary when the attack happened, it added.