Two Iranian men have been charged with operating a long-running international hacking and extortion scheme in which they targeted public institutions with ransomware causing $30 million in losses, the Justice Department announced Wednesday.

A federal grand jury returned a six-count indictment, unsealed Wednesday in Newark, New Jersey, charging Faramarz Shahi Savandi, 34, and Mohammad Mehdi Shah Mansouri, 27, with fraud and conspiracy charges related to the creation of the SamSam Ransomware program. The pair remain at large, possibly still operating in Iran.