Syrian rebels detonate 2 bombs at Aleppo prison

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This image taken from video obtained from Ugarit News, which has been authenticated based on its contents and other AP reporting, shows Syrian rebels preparing to fire a rocket at Mannagh air base in Aleppo province, Syria, Monday, May 13, 2013. The Syrian government wants more details before deciding whether to take part in a proposed U.S.-Russian initiative to negotiate a peaceful end to Syria's crisis, the country's information minister said, staking out a similar position to the main opposition group.(AP Photo/Ugarit News via AP video)

BEIRUT (AP) — Activists say Syrian rebels have detonated two car bombs outside the main prison in the northern city of Aleppo and are trying to storm the facility, where hundreds of regime opponents are believed to be held.

The Britain-based Syrian Observatory for Human Rights says the car bombs exploded simultaneously outside the walls of the central prison Wednesday morning.

Observatory director Rami Abdul-Rahman says the blasts are part of a coordinated rebel assault on the prison, and fierce clashes are raging between President Bashar Assad's troops and opposition fighters around the detention center.

Abdul-Rahman says Aleppo's central prison is believed to be holding about 4,000 prisoners, around 250 are jailed for reasons related to the 26-month-old uprising against Assad's regime.

There were no immediate reports of casualties.