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A documentary made by Iranian state television has, for the first time, shown the country's elite forces in action.

The troops - known as Yegan-e-vizheh - form the country's anti-terrorism squad, as well as being tasked with dealing with threats ranging from hostage situations to urban violence.

The unit helped to quell the unrest after Iran's presidential elections in 2009, in which Iranian security forces were widely criticised for human rights abuses.

The programme has proved controversial on Iranian blogs, with some suggesting the authorities are aiming to deter further protests.

Karen Zarindast reports.

This video was produced by BBC Persian's Saeed Towfighi.