Iran says it'd retaliate against Israel and US bases in the area if/when it's attacked by either of teh two. What I wonder is how prepared Israel is in terms of missile defense. Can the Israeli Arrows and Patriots engage all Iranian missiles headed for the Israeli airspace?
According to FAS.org, Shahab 6 features a range of over 6,000 kilometers and can carry a 1,000 kilogram payload. Whoa! A few of those should be able to level Haifa even with conventional high explosive warheads.
http://www.fas.org/nuke/guide/iran/missile/shahab-6.htm