( CNN ) -- Russian authorities detained 140 people -- more than 30 of them foreign nationals -- on Friday in a raid targeting suspected members of Islamic extremist groups , state media reported . The operation was conducted at a place of worship in Dar Ul-Arkam in southern Moscow , state-run RIA Novosti reported , citing information from law enforcement agencies . Members of Russia 's Federal Security Service , or FSB , carried out the raid along with police . Russia Today , a state-funded television network , said the FSB issued a statement about the raid . This site has been visited in the past by suspected radicals -- some from the North Caucasus region , which includes Chechnya -- the RIA Novosti report said .
State news : The arrests targeted suspected members of Islamic extremist groups . More than half of those arrested are foreign nationals .