Producer Pavel Kostomarov is outside the Investigative Committee building after being interrogated as a witness in the 6 May Bolotnaya Square riot case.

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Producer Pavel Kostomarov, second from left, is outside the Investigative Committee building after being interrogated as a witness in the 6 May Bolotnaya Square riot case. From right: Pavel Kostomarov's lawyer Roman Abalkin, TV host Alexei Pivovarov.

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Producer Pavel Kostomarov, outside the Investigative Committee building after an interrogation as a witness in the 6 May Bolotnaya Square riot case.

10.12.2012#1311072

Producer Pavel Kostomarov is outside the Investigative Committee building after being interrogated as a witness in the 6 May Bolotnaya Square riot case.

10.12.2012#1311055

Producer Pavel Kostomarov, right, leaves the Investigative Committee building after an interrogation as a witness in the 6 May Bolotnaya Square riot case. At left is Pavel Kostomarov's lawyer Roman Abalakin.

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Documentary film maker Pavel Kostomarov (left) enters the building of the Investigative Committee of the Russian Federation where he was summoned to act as a witness on the case of mass riots on Bolotnaya Square on May 6.

10.12.2012#1310890

Documentary film maker Pavel Kostomarov pictured outside the building of the Investigative Committee of the Russian Federation where he was summoned to act as a witness on the case of mass riots on Bolotnaya Square on May 6.

10.12.2012#1310889

Documentary film maker Pavel Kostomarov pictured outside the building of the Investigative Committee of the Russian Federation where he was summoned to act as a witness on the case of mass riots on Bolotnaya Square on May 6.

10.12.2012#1310888

Documentary film maker Pavel Kostomarov (left) pictured outside the building of the Investigative Committee of the Russian Federation where he was summoned to act as a witness on the case of mass riots on Bolotnaya Square on May 6.

10.12.2012#1310887

Documentary film maker Pavel Kostomarov (left) pictured outside the building of the Investigative Committee of the Russian Federation where he was summoned to act as a witness on the case of mass riots on Bolotnaya Square on May 6.

10.12.2012#1310868