Moscow: Investigators in Russia have fully ruled out the possibility that a terrorist attack was behind last week`s Siberian power station disaster which killed at least 69 people, prosecutors said on Monday.
"It has been established that the accident was of a technical nature," the investigative committee of Russian prosecutors said in a statement.
"The concrete causes of the accident will be determined in the course of the investigation. The investigation has fully examined the theory of a terrorist attack and refuted it."
Sixty-nine people have been confirmed dead while six others remain missing in the wake of the August 17 catastrophe at the Sayano-Shushenskaya dam in southern Siberia, Russia`s largest hydroelectric power plant.
Last Friday, a radical Islamist group, Riyadus Salikhiin, claimed it triggered the disaster by detonating an anti-tank grenade in the plant`s turbine hall as part of a campaign of "economic war" against Russia.
Authorities were quick to deny the claim and insisted that a technical fault was to blame for the accident, in which a massive flood of water engulfed some 100 workers in the turbine hall.
Riyadus Salikhiin, which posted its claim on a Chechen rebel website, has been linked to a series of deadly attacks in Russia in recent years.
But Chechen militant groups have also been known to issue false claims of responsibility for incidents later proven to be accidents.