Rebel groups in Syria claim to have broken the regime siege of Aleppo after days of fierce fighting which has killed more than 500 combatants.
The Jabhat Fatah al Sham group said in a statement its fighters are working to "establish control over (the) remaining positions to break the siege".
A commander from another rebel group told Reuters the siege has been broken, but said it was early days and matters are "not easy".
The British-based Syrian Observatory for Human Rights said rebels have linked up with fighters from the city's east, breaking the siege, although no secure corridor has been established.
A pro-Syrian government news outlet affiliated with the Lebanese group Hezbollah, fighting on the side of Syrian President Bashar al Assad, said in a statement there was no truth to the reports.
It came as an airstrike on a hospital in northwestern Syria killed 10 people, including children, according to the Observatory.
The hospital, in the town of Meles, is about 15 km from the city of Idlib in the rebel-held province of the same name.
Syrian government and allied Russian military planes operate in Syria but it is not known which aircraft carried out the strike, the Observatory said.
Rebel and regime forces have been battling for control of Aleppo, Syria's second city, since mid-2012.
Opposition fighters and jihadists took control of territory south of Aleppo on Saturday in a bid to cut off regime forces and open a new route into besieged rebel-held districts.
"The Army of Conquest … took control of the armament school, where there is a large amount of ammunition, and a large part of the artillery school," the Observatory said.
Rahman added that the advance leaves the Assad regime "in a very difficult position despite Russian air support. This is an existential battle. Whoever wins it will win Aleppo," he said.
Syrian state-controlled media said the army has sent reinforcements in a counter-offensive to take on "thousands of terrorist fighters".
An army officer told state television troops had advanced in the areas seized by rebels and were inflicting "heavy losses" on them.
"Of course I have faith in the army, but I can't help being scared," said a 34-year-old resident of a government-held area.
"Food is already getting more expensive and the coming days risk being very difficult".
The Syrian conflict broke out in March 2011 and has killed more than 280,000 people. Over half of the country's population have been forced to flee their homes.
Médecin Sans Frontieres have also reported difficulties in getting medical supplies to the area.
#Syria: al-Daqaq hospital urgently needs to rebuild but sending necessary supplies impossible with east #Aleppo under siege #NotATarget
— MSF International (@MSF) August 6, 2016
