An Iranian nuclear physicist with ties to the reformist movement led by the opposition leader, Mir Hossein Moussavi, has been killed by a bomb near his home.

Dr Moussad Ali-Mohammadi was leaving his house on his way to work at Tehran University when the bomb, attached to a motorbike, went off, killing him instantly.

The Iranian authorities said they suspected the hand of exiled opposition movements working on behalf of America and Israel, a charge denied by Washington.

But Dr Ali-Mohammadi's academic work was highly theoretical and the body responsible for the country's nuclear research programme, which has brought Iran into conflict with the West, said he had no connection with it.

Opposition movement supporters also said he was on a list of 240 academic backers of Mr Moussavi published before last year's disputed election.

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