US-led forces in Iraq say they have arrested an Iranian officer operating in the north of the country.
They say the man was a member of the Quds Force - an elite unit of Iran's Revolutionary Guards - and was detained in the Kurdish city of Sulaimaniya.
"This individual has been involved in transporting improvised explosive devices," the American military said.
The US has accused the Quds Force of helping arm Shia militias in Iraq. Iran denies any involvement with militants.
A statement by the US military said the arrested man had been involved in the "infiltration and training of foreign terrorists in Iraq".
According to a spokesman for the regional government in semi-autonomous Kurdistan, he was taken away overnight in a raid on a Sulaimaniya hotel.
A government official in Baghdad said the arrested man had been part of a commercial delegation, but gave no further details.
Tehran says it supports the US-backed Iraqi government, and blames the violence on the continuing conflicts within Iraq since US-led forces toppled Saddam Hussein in 2003.