Experts warn of challenge of stopping future ISIS-inspired terror attacks

A police officer takes position after a fatal shooting which took place at a police station in Paris, Thursday, Jan. 7, 2016. Officers shot and killed a knife-wielding man with wires protruding from his clothes at a police station in northern Paris on Thursday, French officials said, a year to the day after an attack on the French satirical newspaper Charlie Hebdo launched a bloody year in the French capital. (AP Photo/Michel Euler)