| Rebels outside the city have so far been leading the offensive |
Rebels in Syria have announced a big offensive aimed at breaking the government siege of east Aleppo.
About 275,000 people have been besieged in the east by pro-government forces for several months. The Syrian government said it had repelled offensives on several fronts around Aleppo by both rebel groups and militants from so-called Islamic State (IS).
"Booby-trapped cars, two tanks and a large number of armoured vehicles" were destroyed, the defence ministry said on its website. Syria and its ally Russia have recently intensified air strikes on the east.