MOSCOW, April 8 (RAPSI) – Russia’s Federal Security Service (FSB) has ”neutralized” the activities of Doku Umarov, leader of the Imarat Caucasus terrorist organization, FSB chief Aleksandr Bortnikov said Tuesday during a session held by the intergovernmental National Antiterrorist Committee.

During the first quarter of 2014, more than 33 anti-terrorist operations were carried out, with more than 36 warlords and 65 active militants having been neutralized.

Umarov is one of the most infamous leaders of the North Caucasus extremist underground, allegedly involved in numerous terror attacks. Umarov claimed responsibility for bombings in the Moscow Metro and an attack on Domodedovo International Airport.

News of Umarov’s death have surfaced in the media numerous times in the recent years. The National Antiterrorist Committee has not confirmed his demise.

In December 2013, leader of Chechnya Ramzan Kadyrov stated that Umarov had been dead for a long time, which was allegedly corroborated by the intercepted transmission between the militants. The federal authorities could not confirm that statement.