Syria activists say airstrikes in rebel-held Aleppo kill 20

FILE -- In this Sunday, April 24, 2016, file photo made from video posted online by the Syrian Civil Defense White Helmets, a man helps an injured man as others stand in rubble after airstrikes and shelling hit Aleppo, Syria. A military buildup in northern Syria coupled with heavy fighting and mounting civilian casualties spells the end of a cease-fire that for two months brought much needed relief to war-stricken Syrians, ushering in what could be an even more ruinous chapter in the country's five-year-old conflict. (Syrian Civil Defense White Helmets via AP video, File) (The Associated Press)

In this image made from video on Wednesday, April 27, 2016 and posted online by the Syrian Civil Defense White Helmets, Civil Defense workers stand in rubble after airstrikes hit a hospital in Aleppo, Syria. A series of airstrikes hit a hospital and adjacent buildings in the rebel-held part of the contested city of Aleppo in Syria on Wednesday night, reportedly killing more than a dozen people. (Syrian Civil Defense White Helmets via AP video) (The Associated Press)

In this image made from video and posted online from Validated UGC, a man carries a child after airstrikes hit Aleppo, Syria, Thursday, April 28, 2016. A Syrian monitoring group and a first-responders team say new airstrikes on the rebel-held part of the contested city of Aleppo have killed over a dozen people and brought down at least one residential building. The new violence on Thursday brings the death toll in the past 24-hours in the deeply divided city to at least 61 killed. (Validated UGC via AP video) (The Associated Press)

A Syrian monitoring group and rescue workers in opposition-held areas in Syria say a series of airstrikes has hit a hospital and nearby buildings, killing at least 20 people in the northern city of Aleppo.

The victims include three of the hospital's medical staff.

The head of the Britain-based Syrian Observatory for Human Rights says the airstrikes took place shortly before midnight on Wednesday and that at least one child was among the 20 killed.

The Syrian Civil Defense, volunteer first-responders in rebel-held areas, gave a higher toll, saying the strikes on the Quds hospital killed 22. The dead included one of the few remaining pediatricians in opposition-held areas of the contested city. The Syrian Civil Defense said there were four consecutive airstrikes against the hospital and adjacent buildings.