Online video footage claimed to show rebel fighters flanking the prison walls
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Syria rebels 'in assault on Aleppo prison'

Rebel fighters have launched a massive assault on the prison in Syria's northern city of Aleppo, reports say.

The rebels apparently detonated two car bombs to blast through the walls of the prison, which holds 4,000 inmates including anti-government activists.

The opposition said government forces had counter-attacked using tank shells and air raids.

Sebastian Usher reports.