US to reveal 'evidence' of Iran arming Iraqi militants

The operative word here is suggests, hence the quotation marks in the headline. I have no idea how one would go about proving Iran is involved.

Serial numbers and other markings on bombs suggest Iran is supplying deadly explosives to Iraqi militants, US defence secretary Robert Gates says.

His comments came in some of the Bush administration’s first public statements on evidence collected by the military.

The government and military chiefs have said repeatedly that Iran had been tied to terrorist bombings in Iraq, but up to now have said little about evidence to bolster those claims.

National security officials in Washington and Iraq have been working for weeks on a presentation intended to provide evidence for Bush administration claims of what they say are Iran’s meddlesome and deadly activities.

I would not be the least bit surprised if some of the serial numbers and markings found 'suggest' the US or Russia are supplying the explosives. These areas have had clashes going on for years. There has to be a huge underground/black market arms trade.

Even if Iran isn't supplying directly, they can sell to individuals and countries who might be.

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