The leak of a pair of highly classified U.S. intelligence documents describing recent satellite images of Israeli military preparations for a potential strike on Iran offers a window into the intense American concerns about Israel’s plans. It also has U.S. officials working to understand the size of the improper disclosure.

The two documents were prepared in recent days by the National Geospatial-Intelligence Agency, which is responsible for analyzing images and information collected by American spy satellites. They began circulating on Friday on the Telegram app and were being discussed by largely pro-Iran accounts.

The documents, which offer interpretations of satellite imagery, provide insight into a potential strike by Israel on Iran in the coming days. Such a strike has been anticipated in retaliation for an Iranian assault earlier this month, which was itself a response to an Israeli attack.

One of the documents is titled “Israel: Air Force Continues Preparations for Strike on Iran,” and describes recent exercises that appeared to rehearse elements of such a strike. The second document details how Israel is shifting the placement of its missiles and weapons in case Iran responded with strikes of its own.

Officials were divided over the seriousness of the leak, which did not appear to reveal any new American capabilities. The documents describe but do not show the satellite images. If no further documents come to light the damage would be limited, some of the officials say — besides revealing, once again, the degree to which the United States spies on one of its closest allies. Other officials say that any exposure of an ally’s war plans is a serious problem.

Officials privately acknowledged that the documents were authentic, although the National Geospatial-Intelligence Agency and the Office of the Director of National Intelligence declined to comment.

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