MONTCLAIR, New Jersey (WABC) -- The NYPD's intelligence and Counterterrorism Bureau quietly led the investigation and arrest of two teenagers from New Jersey, with the help of the FBI, for an alleged terrorist plot.

Now police are looking into how the two friends from Montclair, New Jersey, became self-radicalized.

Investigators say they planned to travel abroad to become ISIS fighters.

Newly filed federal documents paint a disturbing picture of what police say the teenagers have been up to over the past few months.

The two 19-year-old former high school athletes are charged with participating in an ISIS-inspired terror ring.

Tomas Kaan Jimenez-Guzel and Milo Sedarat are both from upper-middle-class families who grew up on tree-lined streets in Montclair.

"We're constantly challen

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