Iranian media have blamed Israel and the US for a bomb attack which killed an Iranian nuclear scientist in Tehran. State broadcaster Irib said Zionist and American agents planted a remotely controlled bomb that killed Professor Masoud Ali Mohammadi near his home.<br/><br/>Local media described him as a devoted revolutionary professor. It comes at a time of heightened tension in Iran, following June's disputed presidential election and mass protests against the government. Masoud Ali Mohammadi, a nuclear physics professor at Tehran University, was killed on Tuesday in a booby-trapped motorbike blast in the city's northern Qeytariyeh district.