The FBI is investigating as an "act of terrorism" a knife attack on a Michigan airport police officer Wednesday by a man yelling "Allahu Akbar." The stabbing at Bishop International Airport, in the city of Flint, comes amid a wave of jihadist-inspired attacks in Europe, most recently a foiled bomb assault at a train station in Belgium. US officials identified the suspected assailant, who is in custody and cooperating with investigators, as a 49-year-old Canadian resident from Quebec named Amor Ftouhi. "We're investigating this incident today as an act of terrorism," FBI special agent David Gelios told a news conference,...