Homemade bombs exploded on Saturday in two oil wells in Chechnya and a third device was found in another well in what authorities said they suspected was an attack by rebels in the violence-plagued southern Russian region. Nobody was hurt in the blasts or the fire that raged in one of the wells after the explosions, the interior ministry branch in Chechnya said. The ministry said investigators believe the bombs were placed in the wells near the regional capital, Grozny, by a group of three or four people. After blasts at two wells, authorities found a bomb at a third well and defused it, the ministry said. Major fighting has died down in Chechnya since the second of two separatist wars in the past 12 years began in 1999, but the mostly Muslim region is plagued by rebel attacks as well as violence blamed on Russian federal troops and forces of the Moscow-backed Chechen government. Chechen leaders say the federal government is not giving the region a fair share of proceeds from the sale of the oil it produces.