Shortly after Iran shot down a U.S. drone over the Strait of Hormuz in June, the U.S. launched a secret cyberattack that took out an Iranian database used by Islamic Revolutionary Guards Corps to plan attacks against oil tankers in the Persian Gulf.

Many of the system’s computers are still shut down and the initiative is believed to have crippled Iran’s capacity to seize or block ships in the Gulf, according a report in the New York Times.

Mounting tensions between the two countries have prompted concern that conflicts would erupt in the Gulf, but President Trump pulled back from retaliating against Iran after it downed the drone. The two have a history of engaging in covert cyberattacks.

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