Iran's Revolutionary Guards have shot down a radar-evading Israeli spy drone that was trying to penetrate Iran's Natanz nuclear enrichment site, state news agency ISNA said on Sunday, quoting the Revolutionary Guards.

"The downed aircraft was of the stealth, radar-evasive type and it intended to penetrate the off-limit nuclear area in Natanz... but was targeted by a ground-to-air missile before it managed to enter the area," ISNA said, citing a statement by the Revolutionary Guards.

The Israeli military said it did not comment on foreign reports.

Israel and the West suspect Iran of planning to build a nuclear bomb. Iran has in the past often accused its Western and Israeli foes of trying to sabotage its nuclear programme, which Tehran says is peaceful.-Reuters