A new statement from Doctors Without Borders (MSF) reported a Saudi rocket strike, likely an airstrike, hit one of their hospitals in the Yemeni capital city of Sanaa, killing four people and wounding 10 others, including three MSF staff members.

MSF said they couldn’t yet confirm if the incident was an airstrike or a ground-based rocket firing, but did say Saudi warplanes were flying overhead at the time, and that in addition to the strike that hit the hospital, a second one landed nearby.

MSF Director Raquel Ayora described it as part of a “worrying pattern” of Saudi attacks against medical services, warning that the destruction of the hospital will leave residents in the area without access to healthcare for weeks.

Saudi officials have not commented yet on this latest strike, though historically they’ve offered blanket denials whenever a strike gets them too much negative publicity. This has been particularly true of attacks on hospitals and other obvious civilian targets.