World War 3: Israeli defense ministry bombed, officials avoid using the phrase “terrorist act”. Tit for tat between Iran and Israel?

10 January 2013, the Israeli Defense Ministry building was ground zero for a car bomb explosion.  At least ten people wounded.

However, Israeli officials are avoiding calling it an act of terrorism, instead saying: “The main direction of suspicion is it was criminal.”-Micky Rosenfeld, Tel Aviv police

Witnesses say they saw someone on a motorcycle place a bomb on a Mazda parked near the building.  Is this a tit for tat between Israel and Iran?  After all, that’s how Israeli/U.S. agents in Iran have been killing Iranian nuclear scientists.