At least a dozen civilians have been reported killed as insurgents step up their week-long offensive in Government-held western Aleppo.
Rebel groups detonated at least three car bombs and fired shells close to the positions of pro-government forces on Thursday.
The attacks are part of an attempt to break the government siege in rebel-held eastern Aleppo, which has been in place since July. Insurgents want to seize the government-held areas in order to forge a link between the two halves of the city.
Rebel groups clash in Eastern Aleppo
Their attempts may, however, be undermined by violent clashes which took place between opposition groups in eastern Aleppo on Thursday. The insurgents have been plagued by disunity since the start of the conflict over five years ago.
Planned pause in the fighting
A humanitarian pause in the fighting is expected to take place between 9 am and 7 pm on Friday.
Speaking to the press in Moscow, a member of the Russian General Staff said that two corridors would be opened up to allow armed fighters to leave eastern Aleppo. Lieutenant-General Sergey Rudskoy said that the first corridor would be towards the Turkish border, and the second towards Idlib to the South West.
Six further corridors will be opened up for civilians to leave. Buses and ambulances will be provided for the sick and injured to leave.
Casualties mount on all sides
Casualties continue to mount on all sides of the conflict.
On Tuesday, at least 10 people were killed in airstrikes by warplanes on rebel-held Idlib province. The Syrian Observatory for Human Rights said the airstrikes targeted the headquarters of Fateh al-Sham Front, killing two of their members but also taking lives of ten civilians, including a child and four women.