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The incident occurred in northern Iraq, when a US plane mistakenly targeted a convoy of American and Kurdish soldiers.

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The BBC's John Simpson - who was in the convoy - said he saw a bomb as it fell to earth.

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He said the bomb landed just metres away from him, and he was injured by flying shrapnel.

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A BBC's cameraman also received minor injuries, but continued to film with his blood dripping on the lens.

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A Kurdish official said that at least 18 people were killed, including a translator for the BBC, and more than 40 injured.

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Witnesses said shrapnel was flying about the area and ammunition exploding.

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The reporters' vehicles were destroyed.

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The air strike had been called in by a US special forces commander to attack an Iraqi tank nearby.

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Among the critically injured was Kurdish special forces commander Waji Barzani.

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Anxious Kurdish fighters gathered outside a hospital in the town of Irbil for news on Barzani and others injured.