An Iranian university lecturer was killed when a remote-controlled bomb hidden on his motorbike exploded in Tehran, state-run English-language Press TV reported.
Massoud Ali Mohammadi was a lecturer in nuclear energy at Tehran University.
The website of the state broadcaster said Mohammadi was "assassinated in a terrorist act by counter-revolutionary elements," identifying him as "a committed revolutionary lecturer".
It added that police and security officials had launched an investigation.
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"The explosion took place near the professor's home in Qeytariyeh neighbourhood, in northern Tehran," Press TV said.
Iran's state television accused "US and Zionist agents" of carrying out the bomb attack.
