Russia today marks the third anniversary of the Beslan hostage tragedy in which more than 330 people were killed, most of them children.

A video that remained secret for nearly three years after the horrific Beslan hostage crisis has cast new doubt on official conclusions about what led to the deaths of more than 330 people - more than half of them children - during one of Russia's worst terrorist attacks.

Relatives of the more than 330 victims of the Beslan school siege have released a video that they say proves Russian security forces caused the massacre by firing grenades on the besieged building.

Relatives of victims of the Beslan school siege lit candles in the ruins of the city's School No. 1 to mark the passing of 1,000 days since the hostage taking, RFE/RL's Russian Service reported.