Syria rebels 'in assault on Aleppo prison' Published duration 15 May 2013

media caption Footage purporting to show the attack was posted on the internet

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.

Meanwhile, rebels say claims that one of their commanders desecrated the body of a soldier will be investigated.

Clashes continuing

In Aleppo, rebels appear to have detonated car bombs outside the walls of the prison on Wednesday morning, the UK-based activist group Syrian Observatory for Human Rights said.

Officials said government forces fought back, injuring and killing opposition fighters.

Rebel sources told the BBC that they had broken into the prison, and had made progress in their fight against government forces.

Clashes were reported throughout the day.

The rebels have not stated what the purpose of the assault was, but the jail is reported to be holding some 250 inmates linked to the anti-government uprising.

In other developments:

Web-monitoring groups say the internet had gone down across Syria for the second time in two weeks

The UN General Assembly approves a non-binding resolution calling for a political transition in Syria

'Eat your hearts'

The rebel Free Syrian Army (FSA) has vowed to punish criminals after a video appeared online apparently showing one of its commander cutting out the heart of a soldier.

"Any act contrary to the values that the Syrian people have paid their blood and lost their homes to will not be tolerated, the abuser will be punished severely even if they are associated with the Free Syrian Army," the FSA said, according to AFP news agency.

"The perpetrator will be brought to justice."

The FSA said its field commanders would investigate the video, which shows well-known rebel commander Abu Sakkar standing over the soldier's corpse as he says: "I swear to God we will eat your hearts and your livers, you soldiers of Bashar the dog."

US-based Human Rights Watch said his actions were a war crime.

The UN says nearly 80,000 people have been killed since the uprising against President Assad began in March 2011, and millions have fled their homes.