Rebel celebrates taking Aleppo police station
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Syrian rebels and government prepare for Aleppo battle

Syrian government troops are preparing to launch an offensive on rebel-held districts in the northern city of Aleppo.

Extra troops are being drafted in for the attack in the country's second city which has been the scene of fierce fighting all this week.

The BBC's Middle East Correspondent, Wyre Davies, reports from Syria's border with Turkey.

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