Warplanes continued to pound opposition-held areas of Syria's Aleppo on Monday (September 26th) as residents warned of increasing shortages of food and medicine, AFP reported.

A wave of strikes hit areas of the opposition-controlled east of the city from dawn, in particular al-Mashhad and Sayf al-Dawla districts, sparking large fires.

The Syrian Observatory for Human Rights said "dozens of raids" had hit districts of east Aleppo after midnight on Sunday, with many wounded and at least two civilians killed.

It was the fourth day of intense air raids on the city since the collapse of a short-lived ceasefire brokered by Russia and the US.

The Observatory said Monday that at least 128 people, nearly all civilians, had been killed in raids on eastern Aleppo since late Thursday, including 20 children and nine women.

At least 36 civilians, including 11 children and five women, were killed in raids targeting rural areas of Aleppo province, The Observatory said.

A medical source in opposition-held Aleppo said hospitals were struggling to deal with a huge number of casualties as supplies dwindled.

Nearly two million civilians were left without water on Saturday after regime bombardment damaged one pumping station and opposition fighters shut down another in retaliation, UNICEF said.

UNICEF said the loss of main supplies posed serious health risks in opposition-held areas as the only alternative source of drinking water was from highly contaminated wells.

UN Secretary-General Ban Ki-moon on Sunday urged world powers to work harder to end the "nightmare" in Syria as the Security Council met for urgent talks on the escalating war.