Israel's outgoing home front defence minister says an attack on Iran would likely trigger a month-long conflict that would leave 500 Israelis dead.

Matan Vilnai told the Maariv newspaper that the fighting would be "on several fronts", with hundreds of missiles fired at Israeli towns and cities, BBC reports.

Israel was prepared, he said, though strikes on Iran's nuclear facilities had to be co-ordinated with the US.

Meanwhile, a US blogger has published what he says are Israel's attack plans.

Richard Silverstein told the BBC he had been given an internal briefing memo for Israel's eight-member security cabinet, which outlined what the Israeli military would do to prevent Iran developing nuclear weapons.Tehran insists its nuclear programme is entirely peaceful.