MOSCOW. April 16 (Interfax) - The Federal Security Service (FSB) is checking the radio address made by one of the leaders of the March of Dissent Garry Kasparov on Ekho Moskvy radio for elements of extremism.

Ekho Moskvy's editorial board received a request for its transcripts of the broadcast so that they could be checed for "possible signs of criminal activity in the address by Kasparov on the Counterblow program on April 8," the station said.

The request will also check "Kasparov's calls to take part in the March of Dissent on April 14, which could be qualified as a public call for extremist activity," it said.