United Russia deputy Sergey Zheleznyak is demanding a probe into alleged extremist propaganda on one of the country's most popular social networks, VKontakte.

Zheleznyak, the State Duma vice Speaker, has sent a request to the Prosecutor General's Office and the Russian communications watchdog Roskomnadzor, writes Izvestia daily.

Among videos uploaded by network users MPs discovered extremist material as well as speeches by terrorists – including Russia's most-wanted man Doku Umraov – and other North Caucasus militant leaders.

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