Dozens of children, most believed to be under the age of 10, have been killed after a Saudi-led coalition airstrike hit a school bus in northern Yemen Thursday.
"Following an attack this morning on a bus driving children in Dahyan Market, northern Saada, (an ICRC-supported) hospital has received dozens of dead and wounded", the organization said on Twitter without giving more details.
"This is yet another example of the blatant violations of worldwide humanitarian law that we have seen in Yemen over the past three years-from indiscriminate and disproportionate attacks on civilians, denial of access to humanitarian aid and the use of starvation as a weapon of war-it's the people of Yemen, not the warring parties, who are paying the ultimate price".
The Huthis' Al-Masirah TV, quoting the rebel health ministry, reported that 50 people were killed and 77 wounded, "mostly children", though it was not possible to verify that toll.
Last week, the Saudi-led coalition airstrikes struck the gate of al-Thawra hospital and adjacent fish market in Yemen's Red Sea port city of Hodeidah, killing 52 civilians and wounding 102 others.
Upon interception, Saudis say the missile exploded into fragments that killed one Yemeni civilian and injured 11 other people.
The coalition that has been fighting Yemen's rebels since 2015 acknowledged responsibility for the strike, but claimed the bus was carrying "Huthi combatants".
Citing "local officials", the head of the global aid group's delegation in Yemen says that in total at least 50 people died and dozens more were injured.
It accused the Houthis of using children as human shields and said the strikes were carried out in accordance with global humanitarian law.
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But on social media, critics noted that other coverage of the air strike in the U.S. and Britain-which also supports the coalition-failed to acknowledge the countries' involvement in the war.
Houthi media broadcast what appears to be graphic scenes of the aftermath, depicting children drenched in blood and burned black by the blast.
Say: I want the State Dept to condemn the Saudis for bombing Yemeni children and I want the USA to stop selling weapons to Saudi Arabia.
After today's strike, Lise Grande, United Nations humanitarian coordinator in Yemen, urged all parties to come to the table.
Separately, a White House National Security Council spokeswoman referred to "conflicting reports in global media" and said "we are waiting for an official assessment of what actually happened".
The Houthis have launched a series of missile strikes on the kingdom, including Riyadh, over the past year.
The U.S. said it was not involved in Thursday's assault.
Impoverished Yemen, on the southern tip of the Arabian Peninsula, is now in the world's worst humanitarian crisis, with more than 22.2 million people in need of assistance.