Former head of the Israeli intelligence service Mossad has warned Tel Aviv against waging an air strike on Iran over its nuclear program.

Efraim Halevy, former Mossad chief, says any Israeli attack on Iran would be met with an Iranian counterattack.

"I don't think they're bluffing," Efraim Halevy said of Iranian threats to return fire.

Iranian counterattacks "might not be a last word in the game," said Halevy.

"We would be entering an entirely new area of estimate and counter-estimate," Seattle Post-Intelligencer quoted former spy chief as saying on Friday.

Israeli transportation minister Shaul Mofaz has declared that Israel will attack Iran unless it suspends its enrichment program.

Iran has declared that it would respond strongly to any act of military advanture.

Recently Iran test-fired advanced missiles in a military exercise dubbed The Great Prophet III.

Observers say the military exercise was an indicative of Iran's breakthrough in the field of defense technology.

© Press TV