An audio recording obtained exclusively by The Washington Post is a window into the covert campaign by Israeli intelligence to intimidate Iranian military officials.

Israel announced more strikes against Iran’s military infrastructure, continuing its effort to degrade Tehran’s capabilities. Iranian state news agency IRNA said the capital city’s air defenses were operating throughout the night.

Israel’s warplanes kept up attacks on Iranian missile systems, airfields and the Fordow nuclear site following US strikes at the weekend, as debate raged in the country over how long the campaign should continue.