Iran’s Revolutionary Guards said they arrested eight people accused of passing sensitive military information to Israel’s Mossad during Israel’s June air campaign, which targeted Iranian nuclear sites and killed top commanders and civilians, according to Reuters.

The suspects reportedly received Mossad training online and were detained before carrying out their plans. Authorities also seized materials for bombs and explosives.

Earlier, Iran reported arresting thousands during the 12-day conflict and has executed several individuals on espionage charges, which human rights groups criticize as political repression, Reuters reported.