Iran has hanged a man it said was a Mossad agent who killed an Iranian nuclear scientist in 2010, its state media reported on Tuesday.

Majid Jamali Fashi, 24, was hanged at Tehran's Evin Prison after being sentenced to death in August last year for the murder of Massoud Ali-Mohammadi, the state news agency quoted the central prosecutor’s office as saying. It said he had confessed to the crime.

Ali-Mohammadi was killed in January, 2010 when a remote-controlled bomb attached to a motorcycle exploded outside his home in Tehran. Tuesday’s report claimed Fashi traveled abroad on several occasions to receive training from the Mossad before returning to plot the assassination. Yet Western analysts said Ali-Mohammadi, a 50-year-old Tehran University professor, had little, if any, role in Iran’s sensitive nuclear program.

Last month, Iranian intelligence officials said they had arrested 15 people they called a “major terror and sabotage network with links to the Zionist regime.”