According to Reuters, Iran said on Sunday (August 24) that it shot down an Israeli spy drone that was heading for its Natanz nuclear enrichment site, Iranian media reported.
"The downed aircraft was of the stealth, radar-evasive type and presumably intended to penetrate the off-limits nuclear area in Natanz, but was targeted by a ground-to-air missile before it managed to enter the area," state news agency ISNA said, citing a statement by Iran's Revolutionary Guards.
The Natanz facility is one issue at the heart of a long-running dispute between Iran and countries that believe it is seeking nuclear weapons capability, something Tehran denies.
Iran and six world powers are attempting to negotiate an end to the standoff which has led to damaging economic sanctions imposed on Tehran.
COMMENT: Israel is widely assumed to have the Middle East's only atomic arsenal, demands Iran be stripped of all nuclear technologies, something Tehran rules out and which most foreign diplomats deem unlikely.
Iran has accused Israel and its allies in the West of assassinating its nuclear scientists and attacking its nuclear sites with computer viruses.
The Revolutionary Guards said of the drone incursion: "This wily act further exposed the Zionist regime's adventurous temperament and added yet another black page to a record filled with crime and mischief."
If confirmed, an aircraft built by Israel's state-owned Aerospace Industries known as the Heron, or the more powerful Heron TP, is likely to have been involved for such a long-range mission. Military commanders in Israel have described both as a possible means of monitoring Iran and other countries.
In December 2012, Iran said it had captured a US intelligence ScanEagle drone, but the US said at the time there was no evidence to support the assertion.
In December 2011, Iran said it had captured a US RQ-170 reconnaissance drone which was reportedly lost by US forces in neighboring Afghanistan.
In 2010, Iran's nuclear facilities were hit by a virus known as Stuxnet, which was widely believed to have been developed by the United States and Israel, though no government took responsibility for it.
In March 2014, pumps at Iran's planned Arak reactor, seen by the West as a potential source of plutonium that could be used in nuclear bombs, were subjected to a failed sabotage attempt, a senior Iranian official said.