Authorities say a terrorist plot in Queens has been stopped and a teen is under arrest.

The U.S. Attorney’s Office says the 19-year-old was arrested as part of a “national security investigation.” He was apparently planning an attack using a knife in the name of Islamic terror group ISIS, somewhere in Queens.

The suspect reportedly lives in a neighborhood in East Elmhurst and FBI were still outside his house on Butler Street late Thursday night.

The suspect was reportedly under constant surveillance by law enforcement and insist there was no threat to public safety.

Law enforcement sources told CBS2 that a 19-year-old suspect was allegedly texting with undercover agents and revealed his plans to carry out the ISIS-inspired attack. An exact time and target has not been revealed.

The teen was unknowingly talking with an undercover FBI agent when the plot was discovered as part of the investigation.

The ISIS-inspired suspect is expected to appear in Brooklyn federal court on Friday.

Source: CBS New York