Islamic State has claimed responsibility for an attack on a church in Chechnya that killed three people, the group's Amaq news agency has reported. Four people attacked the Orthodox church on Saturday, killing two policemen and a churchgoer, Russian officials said. The attackers were killed. Amaq said: 'Islamic State fighters executed an attack on "Michael" Church yesterday in Chechnya's capital, Grozny.' Russia, which hosts the soccer World Cup next month, has fought two wars with separatists in the mainly Muslim internal republic since the 1991 Soviet collapse, but such attacks have become relatively rare in Chechnya.