(JTA) — U.S. and British intelligence services reportedly spied on Israel for 18 years after cracking its army’s encryption for communication between fighter jets, drones and army bases.

The leak was reported Friday by The Intercept and the German newspaper Der Spiegel based on documents that came into the possession of Edward Snowden, a whistle blower who used to work for U.S. intelligence before publishing classified material and fleeing to Russia.

Britain and the United States have reportedly used this access to monitor Israel Defense Forces operations in Gaza, watch for a potential strike on Iran, and keep tabs on the drone technology that Israel exports.

According to the reports, the breaking of the drone encryption allowed Britain and the United States to view images and videos broadcast to IDF commands during drone operations in the Gaza Strip, the West Bank, and near the Jewish state’s northern border.

The tracking has been done from a Royal Air Force installation in the Troodos Mountains, near Mount Olympus, the highest point on the Island of Cyprus.

The IDF encryption code was cracked as part of a major intelligence operation that has been conducted by the U.S. National Security Agency, or NSA, and its British counterpart, the GCHQ, since 1998, according to Ynet.

In the photos leaked by Snowden, shots from video recordings taken by Israeli aircraft can been seen in detail, as well as slides prepared by members of the U.S. and British intelligence organizations explaining the significance of the findings.

“This access is indispensable for maintaining an understanding of Israeli military training and operations and thus an insight to possible future developments in the region,” The Intercept quoted a GCHQ report from 2008 as stating. “In times of crisis this access is critical and one of the only avenues to provide up to the minute information and support to U.S. and Allied operations in the area.”

That year, NSA analysts had “collected video for the first time from the cockpit of an Israeli Air Force F-16 fighter jet,” which “showed a target on the ground being tracked,” The Intercept reported.

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