The International Red Cross says the airstrike hit a bus full of children, parked in a busy market in Dahyan, in Sa'ada province - controlled by the Houthis.
The Red Cross said it received the bodies of 29 kids under the age of 15. They comprise mostly AK-47s and small arms, but in some cases authorities have found heavy machine guns and bombs, in particular since Al Qaeda established a presence in the country in 2011. "Causalities from today's attack continue to arrive", the Red Cross stated on August 9. "[ICRC] sending additional supplies to hospitals to cope with the influx". "The school bus was totally burned and destroyed". The attack happened while the bus was stationary.
"There is no military solution to this conflict". "Only a political solution can bring the war to an end and reinstate peace in Yemen". We urge all parties to agree to an immediate cessation of hostilities, return to the negotiation table to commit to a ceasefire and cooperate with the UN Special Envoy Martin Griffiths.
Qassemi further said the countries involved in acts of aggression against Yemeni people resort to such statements in an attempt to cover up their criminal acts and divert world public opinion from the realities on the ground in the war-ravaged country.
The ICRC said in its tweet: "Under worldwide humanitarian law, civilians must be protected during conflict".
Saudi Arabia said it shot down a rebel missile, with shrapnel leaving a Yemeni resident dead and 11 wounded. "This is why we need an independent investigation into attacks on civilians so that perpetrators can be held to account", Ghaly added.
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The Western-backed alliance fighting the Iranian-aligned Houthi group in Yemen said in a statement that the air strikes targeted missile launchers used to attack the southern Saudi city of Jizan on Wednesday, killing a Yemeni civilian there.
The coalition fighting alongside the government against Shiite Huthi rebels in Yemen said it carried out a "legitimate military action" in the area.
Houthi militants responsible for firing ballistic missiles and targeting civilians "will be held accountable", said the Saudi statement.
The coalition, which also includes the United Arab Emirates, intervened in 2015 to try to restore the internationally recognised government after the rebels drove it out of the capital Sanaa.
The Houthis have launched a series of missile strikes on the kingdom, including Riyadh, over the past year. Reuters reported that the militants have fired dozens of missiles into the kingdom in recent months, often intercepted by Saudi forces.
There was no breakdown in the casualties and it was not immediately clear how numerous victims were on the bus itself and how many were pedestrians in the immediate area around it.