A small medical facility run by Doctors Without Borders was hit by an airstrike in Yemen, the organization revealed Tuesday.

The group posted on Twitter that the facility, in Saada, northern Yemen, was hit by several airstrikes on Monday night while patients and staff were reportedly inside the building.

There are conflicting reports about casualties, however. Yemen's state news agency Saba reported a number of patients were injured, while Hassan Boucenine, head of the Doctors Without Borders in Yemen, told The Associated Press that no one was inside at the time.

Both sources did confirm however, that the building was "completely destroyed."

The air strikes also targeted the remainder of an educational complex and a school in the Hidan district, destroying them completely. The houses and private property of citizens living in the nearby area were also damaged during the onslaught, according to USA Today.

A Saudi-led coalition has been launching airstrikes against Yemen's Shiite rebels, also known as Houthis, and their allies since March. Saada, the Houthis stronghold, has faced a particularly intense bombardment. 

The bombing marks the second attack on the international medical charity this month, which is also known by its French acronym MSF, short for Medicins Sans Frontieres.

On Oct. 3, U.S. aircraft bombed an MSF hospital in the Afghan city of Kunduz, killing at least 13 staff members and 10 patients and wounding many others. Gen. John F. Campbell, the head of U.S. forces in Afghanistan, said the hospital was bombed by mistake after Afghan forces requested an air strike. President Barack Obama has since apologized.