MOSCOW, August 6 - RAPSI. The Moscow City Court validated on Monday the extension of the arrest of four alleged participants of the Bolotnaya Square riots, attorney Dmitry Agranovsky told the Russian Legal Information Agency (RAPSI/ on Monday.

He said the court has also extended the arrest of Maxim Luzyanin, Fyodor Bakhov, Andrei Barabanov and Yaroslav Belousov.

The court has dismissed the defendants' cassation appeal.

Clashes with the police flared up on May 6 during an opposition march across Moscow, which had been granted official permission. Tens of protesters and police officers were injured. The police detained over 400 rally participants.

In total, 13 individuals were detained as part of the case: Alexander Dukhanin, Andrei Barabanov, Maxim Luzyanin, Yaroslav Belousov, Rikhard Sobolev, Vladimir Akimenkov, Olega Arkhipenkov, Fyodor Bakhaov, Artyom Savelov, Alexander Kamensky, Mikhail Kosenko, and Stepan Zimin. Kamensky was later released and no charges were brought against him. Maria Baronova, who was under her own recognizance, became a suspect in the case.

Luzyanin, Barabanov, Zimin, Lutskevich, Dukhanina, Belousov, Savyolov and Kosenko were charged with taking part in the riots. Almost 1,300 people were interrogated in the case.