Four makeshift hospitals and a local blood bank in Syria’s Aleppo city have been hit by air raids over the last 24 hours, according to a group of Syrian doctors.

According to the Independent Doctors Association, in one day, four hospitals and the central blood bank, run by IDA, were struck in Aleppo city and are now out of service.

The last Children's Hospital of Aleppo was struck twice in less than 12 hours.

"The doctors could only yell for their colleagues to take cover and shield the babies," the group said in a statement.

The IDA said the four hospitals that were hit -- the children's hospital, Al-Bayan, Al-Zahraa, and Al-Daqaq -- would all be going out of service "as a result of the escalating series of aerial attacks taking place against health facilities in Aleppo by Syrian and Russian warplanes".

Aleppo, Syria's largest city before the war when it had more than 2 million people, has been divided for years into rebel and government sectors and the city. In recent weeks, government forces backed by Russian air strikes have intensified their military campaign against the city's rebel-held areas.

The hospital attacks come as airstrikes by the United States and France inside Syria have killed as many as 140 civilians in a northwestern city and on its outskirts over the past couple of days.

The Syrian Foreign Ministry said on Tuesday that French warplanes had targeted the village of Tukhan al-Kubra in the northern suburb of the city of Manbij in the Aleppo Province, killing 120 civilians.

Tens of other civilians remain unaccounted for following the attack, the ministry added.

More than 280,000 people have been killed since Syria's conflict erupted in 2011, and millions have been forced to flee.