A nuclear physics professor who publicly backed Iranian opposition leader Mir Hossein Mousavi in the June presidential election, was killed Tuesday when a remote-controlled bomb rigged to a motorcycle blew up outside his home.

He was Masoud Ali Mohammadi, 50, a professor at Tehran University. Before the election, pro-reform Web sites published Ali Mohammadi’s name among a list of 240 Tehran University teachers who supported Mousavi.
The government blamed the bombing on an armed Iranian opposition group that is thought to be operated under the direction of Israel and the US.

“In initial investigations, there are some indications of vices of the Zionist regime, the US and their mercenaries in Iran in the terrorist incident.”

What these indications are, however, is elusive at best.

Israel has yet to comment and the U.S. denies the allegations.