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By Suleiman Al-Khalidi
BEIRUT (Reuters) - Syrian rebels stormed an artillery base in the northern city of Aleppo on Friday to try an end the siege of opposition-held areas but the Syrian army said it had repelled the attack and killed hundreds of insurgents.
A quarter of a million civilians still live in Aleppo's opposition-controlled eastern neighborhoods, effectively under siege since the army, aided by Iranian-backed militias, cut off the last road into rebel districts in early July.
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Fighters from a coalition of Islamist rebel groups called "Jaish al Fateh" that includes Jabhat Fateh al Sham, the former al Qaeda-affiliated Nusra Front, Ahrar al Sham and other smaller groups, said they took part of the main fortress-like artillery academy in the Ramousah quarter in southwestern Aleppo.
The artillery base, one of the largest in Syria, is almost 2 km from the besieged opposition area. It has a huge supply of ammunitions and is used regularly to shell parts of the city held by opposition forces.
The rebels are trying to break through a strip of government-controlled territory to reconnect their encircled sector of eastern Aleppo with a swathe of insurgent territory in the west of Syria, effectively breaking the siege.
The fall of that strip would also cut off western Aleppo, which is in government hands.
"There are two suicide bombers who have driven into regime posts inside the artillery base," said Abu al-Walid, a fighter with Ahrar al Sham, who said there was fighting inside the base.
Hundreds of fighters were clashing with government troops only a few hundred meters from each other in parts of the artillery base after breaking into government defenses around the heavily fortified compound, rebels said.
Aleppo, Syria's biggest city before the outbreak of the civil war five years ago, has been divided between government forces and rebels since the summer of 2012.
Seizing full control would be the biggest victory for Syrian President Bashar al-Assad in five years of fighting and demonstrate the dramatic shift of fortunes in his favor since Russia joined the war on his side last year.
Islamist rebels have poured in thousands of fighters mainly from the rebel-held province of Idlib in north western Syria.
Inside the city, Free Syrian Army (FSA), among them vetted U.S.-backed groups, helped pile pressure on the army and its allies along other frontlines.
Jabhat Fateh al Sham, which is believed to have carried out at least three suicide bombings so far, said it also killed a number of Lebanese Shi'ite Hezbollah fighters it said were defending the artillery school.
The militant Shi'ite group that fights alongside Assad's government forces is an ally of Iranian-backed militias and the Russians in trying to help Assad regain control of the opposition-held parts of Aleppo.
The army said it had foiled the attack on the artillery base and two major military academies. Hundreds of insurgents had been killed and much of their equipment and tanks destroyed, the army said. It said the assault was the biggest by rebels against government-held areas in the last year.
"Today there was a large scale attack by the terrorist armed groups and they used all types of weapons but were are fighting this attack and will defeat them," said Brigadier General Deeb Bazi, the head of one of the military academies targeted.
The army said at least a thousand insurgents had been killed since the assault began earlier this week.
Rebels said jets flying at high altitude, believed to be Russian, intensified their strikes on the area but were unable to hold back rebel advances because of the terrain.
(Reporting by Suleiman Al-Khalidi and additional reporting by Tom Miles in Geneva; Editing by Janet Lawrence and Grant McCool)