The charges, first reported Wednesday, mark the latest in a series of U.S. prosecutions tied to what officials describe as Iranian efforts to strike at American interests and allies abroad. The base in question is a key staging point for U.S. operations in Europe and has long been a hub for joint American-British military activity.

Details of the alleged conspiracy remained limited as of Wednesday evening, but the case is expected to renew scrutiny of security arrangements at allied installations and of the broader threat posed by Iran-aligned networks operating across Europe. U.S. officials have repeatedly warned in recent years that Tehran has sought to retaliate against American personnel and facilities in response to sanctions and military pressure.

The three defendants face federal charges in the United States. It was not immediately clear whether they had entered pleas or secured legal representation.

The case arrives amid heightened tensions between Washington and Tehran and follows a string of disrupted plots that U.S. authorities have linked to Iranian operatives or proxies. Lawmakers on both sides of the aisle have pressed the Justice Department and the Pentagon to tighten coordination with European allies on countering such threats.

For communities near bases that host U.S. forces, the allegations underscore the stakes of overseas deployments that often remain out of public view. Local officials and military families have increasingly called for clearer communication about security incidents that could affect service members stationed abroad.

The Justice Department has not announced additional charges, and the investigation is believed to be ongoing. Further court appearances are expected in the coming weeks.