Gates: Bombs tie Iran to Iraq extremists

Serial numbers and other markings on bombs suggest that Iranians are linked to deadly explosives used by Iraqi militants, Defense Secretary Robert Gates said Friday in some of the administration's first public assertions on evidence the military has collected.

While the Bush administration and military officials have repeatedly said Iranians have been tied to terrorist bombings in Iraq, they have said little about evidence to bolster such claims, including any documents and other items collected in recent raids in Iraq.

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. (Would this be like Colin Powell's big presentation before the U.N.? )