MOSCOW, November 26 - RAPSI. Left Front movement coordinator Sergei Udaltsov has been summoned to the prosecutor's office in Moscow once more to discuss whether his movement should be considered extremist after an official examination was conducted into its activity, he wrote on his Twitter page on Monday.

Udaltsov provided clarifications regarding the movement's activity to the prosecutor's office on November 9. At the time, he spoke with prosecutors for several hours. After his interrogation, he said the grounds were likely being prepared to recognize Left Front as an extremist organization.

Udaltsov has been summoned to attend the office on November 27, 11.00.

Earlier, the leftist protest leader stated that one of the reasons for the investigation was the organization of mass riots case initiated against Udaltsov, his aide Konstantin Lebedev, and Leonid Razvozzhayev, aide to oppositionist Duma lawmaker Ilya Ponomaryov, after the TV premiere of the documentary film, "Anatomy of Protest 2."

Udaltsov faces four to ten years in prison. The suspects' homes have been searched.

The filmmakers of the documentary shown on NTV, a channel owned by state-run Gazprom, claim the opposition is preparing a coup using funds from abroad. The film shows Udaltsov and his companions allegedly talking with Georgia's then- Parliamentary Defense and Security Committee head Givi Targamadze, who is said to be experienced in planning the "color" revolutions in Georgia and Ukraine, as well as mass riots in Belarus.