DUBAI, United Arab Emirates — A Saudi-led coalition battling Shiite rebels and their allies in Yemen used U.S.-supplied bombs in an airstrike last month on a market that killed at least 119 people, a human rights group said Thursday, further highlighting American involvement in the conflict.

The March 15 bombing targeting the northwestern town of Mastaba marked the second-deadliest airstrike conducted by the Saudi-helmed campaign since it began its war in March 2015. Condemned by the United Nations, the strike also wounded at least 47 people and left charred bodies lying next to flour sacks and twisted metal.

Human Rights Watch said its investigators traveled to the town in Yemen’s Hajja province, controlled by the Shiite rebels known as Houthis. There, the group said it found fragments of a 900-kilogram (2,000-pound) MK-84 bomb and a kind of satellite-guidance hardware known as a JDAM, which together are known as a GBU-31 bomb.

The group said the bomb, as well as its guidance equipment, was supplied by the U.S. Their finding matched an earlier report by British television channel ITV, which said its journalists found remnants of what likely was another MK-84 bomb and a different kind of satellite guiding system supplied by the United States.

“One of the deadliest strikes against civilians in Yemen’s yearlong war involved U.S.-supplied weapons, illustrating tragically why countries should stop selling arms to Saudi Arabia,” Priyanka Motaparthy, emergencies researcher at Human Rights Watch, said in a statement.

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