MOSCOW, August 21 (RAPSI) – The Moscow City Court on Wednesday upheld detention of a volunteer of the Russian social-liberal party Yabloko Valery Kostenok as part of a case over mass riots occurred in Moscow on July 27, RAPSI learnt from the court’s press service.

The man will stay detained until October 11,

Kostenok is charged with participation in the riots. He pleads guilty.

Unauthorized rallies in support of candidates seeking to become lawmakers of the Moscow State Duma but refused registration by the Election Commission were held on July 27 and August 3 in central Moscow. Over 1,000 people were arrested for various violations as a result.

After the 27 July rally, the Investigative Committee opened a criminal case over mass riots. Investigators believe that the protest action was held with the use of force against representatives of authority.

Several opposition figures including Alexey Navalny, Dmitry Gudkov, Ilya Yashin were arrested and put in detention for alleged organization of an unauthorized rally.