An anti-Israel hacking collective has seized “highly sensitive” nuclear data and satellite imagery from the International Atomic Energy Agency (IAEA), the world’s top nuclear watchdog, according to the website Cryptome.

This is the second time in two weeks that the IAEA’s internal computer systems have been hacked by a group calling itself Parastoo, which is the Iranian word for a swallow (bird).

Parastoo stole the personal information of nearly 200 IAEA scientists and officials last week, including one employee in the United States Department of Energy’s (DOE) Office of Science. DOE is responsible for overseeing America’s nuclear arsenal.