Four Americans killed in southern Iraq bombing (AFP)

BASRA, Iraq (AFP) - Four American security guards were killed when a bomb targeted a US diplomatic convoy in the southern Iraqi town of Basra.

There were "no diplomats" among the casualties, a British diplomat told AFP.

"The four Americans who have been killed were all in the front car" leading the convoy, he said Wednesday.

Pictures taken at the scene in northern Basra showed a silver-coloured four-wheel drive vehicle on its roof with two bodies, wearing bullet-proof jackets, nearby.

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