Sadly, they happen all the time from groups of any religion, but not even liberal media reports it that much since they're so busy in the middle east with groups like ISIS to report groups like America's (yes, America's) Army of God, a bunch of other non-Muslim groups, and a few Muslim terrorist groups that AREN'T ISIS or the Taliban. Liberals are hypocrites though! (I find that sometimes I agree with conservatives and sometimes liberals, depends on what issue it is)!