Actually they were Chechens not Russians, get educated. Chechnya is a Muslim Region controlled by Russia and they are notorious for their Radicalized Islam. You think 5 people in bomb is large think about 200 Russians dying from these guys. I understand that you say that not all Muslims are terrorists however a good portion are radicalized.Or about 7%. You might think that is small but 7% of 1.3 billion is 91 MILLION. That is more than the population of Spain and Italy.