Three medical facilities run by Doctors Without Borders have been bombed in the past three months in the Saudi-led war in Yemen, while human rights organizations have accused the U.S.-backed coalition of war crimes for targeting civilian areas.

A hospital supported by Doctors Without Borders — which is known internationally as Médecins Sans Frontières, MSF — in northern Yemen was bombed Sunday, killing at least five people and wounding nine more. Several buildings were also destroyed in the attack.

The international humanitarian organization said it could not officially confirm the origin of the attack, but Saudi-led coalition planes were seen flying over the hospital at the time of the bombing, and rebel groups do not have planes, leaving little doubt that the U.S.-backed coalition is responsible.

The details of the attack are quite similar to those of previous coalition bombings of Yemeni hospitals. As was the case in the former attacks, MSF made it clear that it provided GPS coordinates of its medical facility.

“All warring parties, including the Saudi-led coalition, are regularly informed of the GPS coordinates of the medical sites where MSF works and we are in constant dialogue with them,” explained Raquel Ayora, MSF director of operations.

“There is no way that anyone with the capacity to carry out an airstrike or launch a rocket would not have known that the Shiara Hospital was a functioning health facility providing critical services and supported by MSF,” she added.

Scores of other Yemeni hospitals have also been shelled by Saudi-led forces, and Shiara Hospital had in fact already been bombed at least once before MSF started supporting it. MSF stressed in a statement that attacking hospitals is a violation of international humanitarian law and constitutes a war crime.

In October, the U.S.-backed coalition bombed an MSF hospital in Yemen, in an attack the U.N. condemned. Several people were injured, and the building was razed to the ground.

This attack came just weeks after the U.S. bombed an MSF hospital in Kunduz, Afghanistan, killing at least 30 people, including 14 staff members. MSF called the attack a “war crime,” and the U.S. refused to allow an independent investigation into the incident.

In December, the Saudi-led coalition bombed another MSF medical facility in Yemen’s southern city of Ta’iz, which had treated 480 patients in the two days before the attack. At least nine people were injured in the bombing.

The death toll in this weekend’s attack is still rising, as people who were trapped in the rubble are uncovered and survivors succumb to their wounds. Four deaths were announced on Sunday, and a fifth victim died Monday morning.