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Syrian rebels 'start Aleppo offensive' Syrian rebels 'start Aleppo offensive'
(35 minutes later)
Syrian rebels announce offensive aimed at breaking government siege in country's second city Aleppo Syrian rebels have announced a big offensive aimed at breaking the government siege of rebel-held east Aleppo.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version. A UK-based monitoring group said rebels had fired "hundreds" of missiles into western Aleppo, killing at least 15 civilians.
If you want to receive Breaking News alerts via email, or on a smartphone or tablet via the BBC News App then details on how to do so are available on this help page. You can also follow @BBCBreaking on Twitter to get the latest alerts. They are also reported to have targeted al-Nayrab military airport to the east.
About 275,000 people have been besieged by pro-government forces since September.
Syria and its ally Russia have recently intensified air strikes on the east.
The attacks are so far coming from rebels outside Aleppo, but it is understood that rebels inside the city will join the offensive.
"All the revolutionary factions, without exception, are participating in the battle," the military spokesman for the Fastaqim faction inside the city said, AP news agency reported.
The UK-based Syrian Observatory for Human Rights (SOHR) said rebels had fired Grad missiles at al-Nayrab.