Forces loyal to Syrian regime leader Bashar al Assad killed at least 53 people, including 15 children in aerial bombardments of the opposition-held neighborhood of Al Shaar and other areas controlled by opposition forces located in the district of Aleppo on Wednesday and Thursday, according to the Syrian Observatory for Human Rights (SOHR).
However, a spokesman for the local rescue services in opposition-controlled areas of Aleppo, put the death toll at more than 60.
The raids consisted mainly of air strikes and barrel bomb attacks which targeted markets, shops and residential complexes - with many buildings reduced to rubble, leading to large numbers of fatalities, rescue services spokesman, Khalid Khatib told Reuters via an Internet messaging service.
"The situation is disastrous in Aleppo. Most areas are totally destroyed," he stated as he described a five-storey building leveled to the ground by air strikes, and people fleeing the area.
Al Jazeera correspondent added that a total of 60 people have lost their lives during the last three days in the divided district of Aleppo, due to continuous bombings aimed at the district in response to the attacks on the regime-held areas by opposition forces.
Clashes between the regime and armed opposition groups in Aleppo started in 2012, leading to mass destruction and bombardment in the province.
Armed opposition forces took control of parts of the city after confrontations and clashes with regime forces and pro-regime militias.
The Syrian regime has waged a campaign of intense air strikes in Aleppo since Dec. 18, 2013.
By the end of the year, 1 million more Syrians could be displaced within their own country, a senior UN official stated last week, especially due to evacuations from Aleppo and southern city of Deraa, as clashes intensify in those areas between regime and opposition forces.
More than 250,000 Syrians have been killed so far in the country’s four-year conflict, according to UN estimates.
More than 7.6 million Syrians, 70 percent of the country's population, are displaced internally while at least 5 millions have fled the country to neighbouring Turkey, Iraq, Lebanon and Jordan.