U.S. Deputy Attorney General Rod Rosenstein at a press conference announced the indictment of nine Iranians who allegedly stole data from researchers around the world.

According to the indictment, 3768 of the hacked professors were at 144 U.S. universities, and the attackers stole data that cost these institutions about $3.4 billion to “procure and access.” The accused allegedly set up an institute in Iran called Mabna that coordinated and paid for the hacks. The defendants then sold the stolen data through two websites, Gigapaper and Megapaper. The institute, the indictment says, aimed to “assist Iranian universities, as well as scientific and research organizations, to obtain access to non-Iranian scientific resources.”