Al-Jazeera Video: Blast kills Iranian nuclear physicist

"An Iranian nuclear physicist has been killed in Tehran - a killing the government is placing squarely on the shoulders of the US and Israel. The US has denied this calling it absurd. Massoud Ali Mohammadi was leaving for his job at Tehran University, when a bomb placed on a motorcycle near his house went off. Al Jazeera's Alireza Roneghi reports from Tehran (12 Jan 10)."