Russian warplanes have resumed heavy bombing in rebel-held eastern Aleppo after several days of relative calm, with observers reporting at least 50 people, including children, have been killed in airstrikes, according to ABC News.

The Syrian Observatory for Human Rights monitoring group said airstrikes mostly hit the Bustan al-Qasr neighborhood.

The Observatory said the death toll from bombing in Bustan al-Qasr, Fardous and other neighbourhoods rose to at least 25, with scores of wounded.

At least 50 civilians were killed by strikes on the rebel-held part of the city and nearby villages controlled by opposition fighters, residents and rescue workers said.

In Bustan al-Qasr, residents said, the strikes hit a medical center and a children's playground.

Source: MENA