According to a CNN report, munitions experts say a U.S.-made bomb was used by the Saudi-led coalition in a recent airstrike in Yemen that hit a busload of children in a marketplace, killing 51 people, including 40 children.
CNN said Friday that the experts identified the bomb used in the attack from images taken of a piece of shrapnel shortly after the deadly strike.
According to CNN, the numbers on the shrapnel indicated the explosive was a 227-kilogram, laser-guided MK 82 bomb manufactured by top U.S. defense contractor Lockheed Martin.
Seventy-nine people were also wounded in the strike, including 56 children.
A spokesman for the Saudi-led coalition said earlier this month the airstrike targeted Houthi rebels in the market and conformed with international and humanitarian law.
U.S. President Barack Obama banned the sale of precision-guided weaponry to Saudi Arabia in 2016 after Saudi Arabia used a similar bomb in another deadly attack.
The Trump administration, however, overturned the ban last year.
Liz Throssel, a spokeswoman for the U.N. High Commissioner for Human Rights said after the August 9 airstrike that hit the bus that "any attack which directly targets civilians not directly taking part in hostilities or civilian objects amounts to a war crime."
She said the perpetrators must be identified, brought to justice and held accountable no matter where, when, or by whom the violations or abuses were committed.