Authorities fear "Lone Wolf" killers harder to stop than Terrorists

An elderly man enters a crowded museum carrying a rifle and begins shooting. A young man in Arkansas pulls the trigger outside a military recruiting office. Another man opens fire in a Kansas church.

Three chilling, unconnected slayings in less than two weeks. One gunman was a white supremacist, one a militant Muslim, one a fervent foe of abortion.

Each suspect had a history that suggested trouble. Each apparently was driven to act by beliefs considered by some as extreme. Each shooter fits the description of a "lone wolf" terrorist, a killer whose attack, authorities say, is harder to head off than if planned by a trained terrorist network.

Police have feared the rise of lone terrorists that are the worst case to follow and trace back. there are no signs of attack, no warning before hand. It is more likely going to be the guy in his basment buillding himself up with hate and rage until he gets to that boiling point and explodes. Then becomes violent and unpredictable.