Iranian authorities are sweeping up hundreds of people deemed suspected spies or infiltrators. Some worry the campaign could become a broader crackdown on political opponents and minorities.

Iran has escalated its internal crackdown, executing suspected spies and arresting over 700 people in just 12 days amid its conflict with Israel.

Israel had been reportedly surveilling Iran for years before deciding to attack the country’s nuclear operations earlier this month. Its spy agency, Mossad, concluded that Tehran’s nuclear and missile programs had advanced more than previously known.