The Saudi-led coalition bombing rebels in Yemen launched an investigation Tuesday following global condemnation of an air strike that Doctors Without Borders said killed 11 people at a hospital it supports.
"Although we do not know the cause of this incident, it underlines the risk taken by humanitarian workers on the ground", Stephen Ryan said. Nine people - including a staff member - were killed immediately, and two others died as they were transported to another hospital, the group said.
MSF said that aerial bombardment had continued despite its sharing of its hospitals' Global Positioning System coordinates with the parties involved in the conflict, including the one in Hajjah governorate attacked on Monday.
The coalition has been battling Iran-backed rebels since March 2015 in support of Yemen's government, after the insurgents seized Sanaa before moving into other parts of the country.
The coalition resumed air strikes on Sanaa on August 9, less than 72 hours after the talks were suspended, with one raid reported to have hit a food factory in the city during working hours, killing 14 people.
In one case, the team held the coalition responsible for hitting an MSF-run hospital but accused the rebels of having used the facility as a hideout.
London-based watchdog Amnesty International described the hospital's bombardment as "a deplorable act that has cost civilian lives, including medical staff". "Either intentional or as a result of negligence, this is unacceptable".
In Yemen, the Saudi involvement behind the strikes is likely because the facilities that have been hit have been in rebel Houthi areas. "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 said the doctor team is busy treating the injured.
The health care facility was partially destroyed, said MSF. "We can't work in it without major repairs".
Doctors Without Borders aid has claimed it is not the first time a hospital supported by the group has been attacked in Yemen.
Fresh coalition strikes on Tuesday struck Abs, Saada and areas surrounding Sanaa, military sources and residents said. A Saudi-led coalition is backing the Abedrabbo Mansour Hadi government in its fight against Houthi rebels, according to BBC. The Saudis denied hitting a school, saying the target was a Houthi training camp and accusing the rebels of recruiting children.
United Nations chief Ban Ki-moon had accused Saudi Arabia of threatening to cut off funding to United Nations aid programmes over the blacklist, a charge denied by Riyadh.
"The secretary general notes with dismay that civilians, including kids, continue to suffer the brunt of increased combat and military operations in Yemen", the instruction read. The coalition added that it will make its findings from the investigation public.
A USA aerial attack on an MSF-run hospital in Afghanistan last October killed 42 people.