A son of the president of Russia's Tatarstan region was named among 50 people thought to have been killed in a plane crash in the region's capital.
Rustam Minnikhanov's son, Irek, was on the flight from Moscow to Kazan, according to a passenger list posted by news websites whose authenticity was confirmed by the regional government.
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The legal battle began in 2011.
The debate during eight weeks of campaigning has been divisive and the result should be known on Saturday.