The NYC bombing suspects pledged allegiance to ISIS, authorities say. What does that actually mean?

By Eric Levenson, CNN (CNN) — The 18-year-old from Pennsylvania had just been arrested for allegedly attempting to detonate two bombs at a New York City protest when he arrived to the NYPD precinct on March 7. As laid out in a criminal complaint, Emir Balat waived his Miranda rights, took paper and pen, and