Hospitals and clinics in Yemen have faced continuing, “deliberate” attacks, an appalling trend that “disrespects the neutrality of health facilities” in war, the International Committee of the Red Cross (ICRC) said Tuesday.

Nearly 100 hospitals throughout Yemen have been attacked since March, the ICRC said, with the most recent airstrike hitting a clinic on Sunday in the southern city of Taiz—one the country’s most populous regions, which has been under heavy fire for months. The shelling of Al-Thawra hospital in the south came just weeks after a Doctors Without Borders/Médecins Sans Frontières (MSF) clinic was hit in Haydan, in the north.

“Al-Thawra hospital, one of the main health care facilities in Taiz which is providing treatment for about 50 injured people every day was reportedly shelled several times on Sunday. The shelling endangered the lives of patients and staff on site,” Kedir Awol Omar, the deputy head of the ICRC delegation in Yemen, said on Tuesday. “The neutrality of healthcare facilities and staff is not being respected. Health facilities are deliberately attacked and surgical and medical supplies are also being blocked from reaching hospitals in areas under siege.”

Airstrikes on medical clinics are “a flagrant violation of international humanitarian law,” ICRC said.

MSF also said on Tuesday that it has been unable to deliver essential medical aid to two hospitals stationed in a particular volatile corner of Taiz, where almost half of health facilities face an influx of wounded patients along with a scarcity in supplies.

“A large part of the population of Taiz is displaced within the city,” said Karline Kleijer, MSF’s emergency manager for Yemen. “They are battling for their survival on a daily basis, and fighting to get hold of sufficient food and water, due to the steep cost of basic necessities and the prevailing insecurity.”

“The situation in Taiz is dramatic and will only get worse in the coming weeks if no efforts are made to spare civilians from the violence and allow them to access basic services, including health facilities,” Kleijer said.

Saudi officials have not responded to the most recent bombing, but they denied being aware that the October airstrikes in Haydan had targeted a clinic.