BENI, Congo - A suicide bomber attacked a restaurant and bar Saturday as patrons gathered on Christmas Day, killing at least six others in an eastern Congolese town where Islamic extremists are known to be active.Heavy gunfire rang out shortly after the bomb went off, with panicked crowds fleeing the town's center.Saturday's attack marked the first known time that a suicide bomber has killed victims in eastern Congo, where an Islamic State group affiliate earlier this year took responsibility for a suicide bombing near another bar in Beni who had caused no other casualties.The latest violence only deepens fear that religious extremism has taken hold in a region already plagued for years by rebels.RELATED: FBI: Pan Am Flight 103 bombing.