Former Mossad Chief Ephraim Halevy told Time magazine in an interview published Thursday that an Israeli attack on Iran "could have an impact on us for the next 100 years" and should only be considered as a last resort.

Halevy, who currently heads the Center for Strategic and Policy Studies at Hebrew University in Jerusalem, added that an Iranian attack on Israel would probably have little impact, because Iranian missiles would largely be intercepted by Israel's advanced anti-missile defense system.

Another former senior Mossad official, who reportedly served during Prime Minister Ehud Olmert's administration, told the American magazine that "Iran's achievement is creating an image of itself as a scary superpower when it's really a paper tiger."