By Shuaib Almosawa, Ben Hubbard and Eric Schmitt
DAHYAN, Yemen — The boys crammed into the bus, their thin bodies packed three to a seat, with latecomers jammed in the aisle. They fidgeted with excitement about the day’s field trip, talking so loudly that a tall boy struggling to get their attention put his hands over his ears and yelled.
Hours later, most of them were dead.
During a stop for snacks in the poor village of Dahyan in northern Yemen, an airstrike by the Saudi-led coalition of Arab nations hit nearby, blasting the bus into a jagged mass of twisted metal and scattering its human cargo — wounded, bleeding and dead — in the street below, according to witnesses and parents.
“My leg is bent,” cried a young boy covered in blood, examining his damaged limb. “A jet hit us,” he said in a video taken at the scene after the airstrike.
Yemeni health officials said 54 people were killed, 44 of them children, and many more were wounded.
Yemen’s conflict began in 2014 when Houthi rebels, who are aligned with Iran, seized control of the capital, Sana, and sent the government into exile. In March 2015, Saudi Arabia — Iran’s chief rival for power and influence in the Middle East — formed a coalition of Arab nations and launched a military intervention aimed at restoring Yemen’s government. It has so far failed to do so.
The Aug. 9 attack was particularly shocking, even for a war in which children have been the primary victims, suffering through one of the world’s worst humanitarian crises, with rampant malnutrition and outbreaks of cholera. The war had killed more than 10,000 people before the United Nations stopped updating the death toll two years ago.
The strike also revived questions about the coalition’s tactics and the United States’ support for the campaign.
American military leaders, exasperated by strikes that have killed civilians at markets, weddings and funerals, insist that the United States is not a party to the war. Human rights organizations say the United States cannot deny its role, given that it has sold billions of dollars in weaponry to allied coalition states, provided them with intelligence and refueled their bombers in midair.
Congress has shown increasing concern about the war recently. A defense policy bill that President Trump signed on Monday included a bipartisan provision that requires Secretary of State Mike Pompeo to certify that Saudi Arabia and its close ally the United Arab Emirates — the two countries leading the coalition — are taking steps to prevent civilian deaths.
If Mr. Pompeo cannot provide the certification, the legislation prohibits the American refueling of coalition jets.
Mr. Pompeo raised the bus attack by phone this week with Crown Prince Mohammed bin Salman of Saudi Arabia, the kingdom’s defense minister. And Defense Secretary Jim Mattis dispatched a three-star general to Riyadh, the Saudi capital, to press the Saudis to investigate the bus bombing.
In the wake of this attack, individual members of Congress have gone further, calling on the military to clarify its role in airstrikes on Yemen and investigate whether the support for those strikes could expose American military personnel to legal jeopardy, including for war crimes.
A Yemeni man held a boy who was injured by the airstrike in Saada last week.CreditNaif Rahma/Reuters
At the same time, however, the defense contractor Raytheon has lobbied lawmakers and the State Department to allow it to sell 60,000 precision-guided munitions to Saudi Arabia and the United Arab Emirates in deals worth billions of dollars.
The Saudi-led coalition says it works to avoid civilian casualties and accuses its enemies, the Houthis, of using civilians as human shields.
The day of the strike, the coalition’s spokesman, Col. Turki al-Malki, said coalition forces had hit a “legitimate military target” after a Houthi missile killed one person and injured 11 in southern Saudi Arabia, which borders Yemen.
“All of the elements that were in the bus were targeted,” Colonel Malki told the Saudi-owned Al Arabiya network, saying they included “operators and planners.”
The next day, the coalition said the bombing had been referred for internal investigation after reports that “a bus was subject to collateral damage.”
Human rights groups say that they doubt the coalition would find itself at fault in any investigation.
“The Saudis aren’t learning,” said Larry L. Lewis, a former State Department official who visited Saudi Arabia five times in 2015 and 2016 to help the country’s air force improve its targeting procedures and investigations. “They’re making the same mistakes they’ve been making all along. And we are not pressing the issue. We are letting them get away with it.”
A visit to the site of the attack, interviews with witnesses and a review of videos from the day painted a picture of the strike’s human cost.
The boys on the bus ranged in age from 6 to about 16, and most were from Dahyan, a poor village in Saada Province along the border with Saudi Arabia.
The province is the homeland of the Houthis, and the coalition has bombed it heavily. For their part, the Houthis have used the area to launch attacks on the Saudi border and to fire missiles into the kingdom.
The boys had been part of a religious summer program organized by the Houthis, and the field trip was meant to be a treat.
When they packed into the bus that morning, one boy, Osama al-Humran, filmed his classmates squirming in their seats with his cellphone. Many were wearing sport coats over their Yemeni gowns, dressed up for a special occasion.
مشاهد توثق لحظات ما قبل مجزرة طلاب ضحيان صعدة Video by هنا المسيرة