BBC: The most senior US military official has accused Iran of increasing the flow of weapons to Iraqi insurgents.
Adm Mike Mullen, chairman of the Joint Chiefs of Staff, also said Iraqis were being trained in Iran to fight against US troops.
But he said there was "no smoking gun" proof that the highest Iranian leadership was involved.
Tehran has previously accused the US of itself bringing terrorism to the region following the 2003 invasion.
Washington has frequently accused Iran of sending weapons to Iraqi insurgents, but Adm Mullen said the rate of delivery was steadily increasing, and was affecting not just Iraq but other countries in the region. Iran ‘Stepping Up Arms to Iraq’ >>>
The Dawning of a New Dark Age (Paperback - UK)
The Dawning of a New Dark Age (Hardback - UK)
