INDIANAPOLIS — A suburban Indianapolis teenager accused of trying to travel overseas to join the Islamic State militant group has been formally indicted.

A federal grand jury indicted Akram Musleh on Wednesday on a charge of providing material support to a terrorist organization. The Brownsburg man, who was 18 at the time of his June arrest, faces a Sept. 23 initial hearing. He’s being held in federal custody.

FBI agents arrested Musleh as he tried to board a bus to New York. Prosecutors have said he planned to fly to Morocco and on to territory controlled by the Islamic State. A criminal complaint alleges Musleh intended to join the terror group.

In a statement, defense attorney Thomas Durkin said the case “will demonstrate the problems inherent in attempting to shoehorn foreign policy into the federal criminal justice system.”