Russian authorities detained 140 suspected Muslim extremists in the capital city of Moscow today. At least 30 of those are foreign nationals. Russian Federal Security Service FSB said that the suspects were detained in a mosque where visitors often converted to radicalism and joined militant groups active in the North Caucasus. Also they were also participating in preparing and perpetrating terrorist acts in Russia.
Most Russian encounters with extremist violence have occurred in the North Caucasus, primarily in the Muslim majority states Chechnya and Dagestan.
There is no link to the Boston bombings, which were perpetrated by native Chechens.
President Putin has said yesterday that the attack warrants dealing harshly with radicals and that Russia and the USA should cooperate in the fight against political Islam.