A court in the capital of Russia's Republic of Tatarstan has opened hearings into the sinking two years ago on the Volga River of a tourist boat in which 122 people died.
Some 200 witnesses and victims are attending the trial in Kazan.
Five defendants in the trial over the "Bulgaria" sinking -- including a tourist company official, an aide to the ship's captain, and local river transportation safety officials -- have been charged in the case.
The charges include violations of river transportation regulations, violations of safety regulations aboard a vessel, negligence, and mishandling of a river vessel resulting in mass deaths.
The July 2011 tragedy was Russia's worst riverboat disaster in decades.
Based on reporting by ITAR-TASS and Interfax