Syrian government attacks on hospitals in Aleppo have devastated the frontline city's health care, with roughly 95 percent of doctors having fled, been detained or killed, Physicians for Human Rights said Wednesday.

AFP reports that, according to the rights group, less than a third of city's hospitals are functioning as a result of 45 attacks in the past three years.

"The Syrian government is using attacks on Aleppo's health care system as a weapon of war," said Michele Heisler, one of the authors of the report.