Three men, including one already jailed in the United States, were accused by U.S. authorities Tuesday of being Iran-supported operatives who plotted nearly 20 attacks on Jewish communities in Europe and the U.S. as well as a planned assault on a British airbase used by the U.S. Air Force.

Charges against Mohammad Baqer Saad Dawood al-Saadi, a dual Iranian-Iraqi national; Mohsen Mohajeri, an Iranian national; and Mohammad Ali al-Hassani, an Iraqi national, were outlined in a superseding indictment unsealed in Manhattan federal court.

U.S. Attorney Jamie McDonald in New York said in a news release that al-Saadi, who was arrested in the spring, continued to coordinate with his co-defendants in the days leading up to the attempted September terrorist plot at a British Royal Air Force Base in Fairford, United Kingdom, where U.S. bombers and troops had been stationed.