Dr. Muhammad Waseem Moaz, 36, was one of more than 50 people killed in the strike on Al Quds hospital, run by Medecins Sans Frontieres in the rebel-held city where experts warn the number of doctors is already limited, the BBC reported.

“Dr. Maaz was martyred due to what staff on the ground believe to be an airstrike perpetrated by the regime or its allies on Al Quds Hospital...The warplane directly targeted medical facilities, staff and civilians in the area in addition to patients in and outside the hospital.”

Dr. Mahmoud Mustafa in Gaziantep, director of the Independent Doctors Association, wrote in a statement.