Iran, which does not recognise the existence of Israel, has confirmed it supplied Palestinian fighters from Hamas and the Islamic Jihad with the technology for the rockets being fired relentlessly into Israel from Gaza since July 8.
"We will accelerate the arming of the West Bank and we reserve the right to give any response," said General Amir-Ali Hajizadeh, commander of aerial forces of Iran's elite Revolutionary Guards, in a statement on their official website sepahnews.Com.
He also said Israel was acting like a "rabid dog" and "a wild wolf", causing a human catastrophe that must be resisted.
The death toll from seven weeks of violence in Gaza rose to 2,124 on the Palestinian side today. Sixty-eight Israelis have been killed, four of them civilians and the rest soldiers.
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Since a ceasefire arrangement collapsed on August 19, more than 650 rockets have struck Israeli territory from Gaza and around 100 others have been shot down.
Natanz is Iran's main uranium enrichment site, housing more than 16,000 centrifuges. Around 3,000 more are at the Fordo plant, buried inside a mountain and hard to destroy.
Israel has often threatened to attack Iranian nuclear installations.
An Israeli spokesman told AFP in Jerusalem yesterday after the report that the drone had been shot down that the military does "not address foreign media reports".
Hajizadeh said at a news conference broadcast on television that the unmanned aircraft shot down was a "Hermes" stealth drone that "can evade radar".
"It was spotted by our surveillance system and shot down by a Revolutionary Guards surface-to-air missile," Hajizadeh said.
According to Hajizadeh, the drone was equipped with two cameras capable of taking high-quality images.
Footage of the recovered drone pieces was aired on Iranian television.
Iran and the P5+1 powers -- Britain, China, France, Russia, the United States and Germany -- are in negotiations to secure a nuclear deal.
They reached a six-month interim agreement under which Iran suspended part of its nuclear activities in return for a partial lifting of international sanctions.