British prosecutors charged two men Tuesday under the National Security Act in connection with a security incident last month at RAF Fairford in southwest England.

Mohmed Abdulkarim, a 24-year-old British national, faces one count of engaging in conduct likely to materially assist a foreign intelligence service between August 31 and September 28. Police stated the service in question is believed to be Iran's. Nouman Essghir, also 24 and a dual British-Iranian national, was charged with entering a prohibited place for a purpose prejudicial to the United Kingdom on August 22.

The pair, both London residents, are scheduled to appear at Westminster Magistrates' Court later Tuesday. Five other men arrested in connection with the case remain on police bail.

The charges stem from events on September 27, when police responded to reports of suspicious activity involving several white vans near the base. RAF Fairford had hosted U.S. B-1 bombers conducting strikes on Iran earlier in the year. The U.S. later withdrew the aircraft from the site on security grounds.

Prime Minister Andy Burnham stated earlier this month that the activity at RAF Fairford was highly likely coordinated in Iran and almost certainly directed by Iran's Islamic Revolutionary Guard Corps. Iran's ambassador to Britain has denied any involvement.

Assistant Commissioner Laurence Taylor, head of national counter-terrorism policing, said investigators have observed multiple incidents in recent months believed directed by the Iranian state. He emphasized ongoing efforts to counter such threats.

The Crown Prosecution Service confirmed the charges followed a Counter Terrorism Policing investigation into the high-profile incident at the Gloucestershire base.