BAGHDAD, Iraq (CNN) -- Coalition forces on Thursday arrested a suspected member of an elite Iranian unit that has been accused of training and equipping insurgents in Iraq, the U.S. military said.

The military said the suspect, who was not identified, is a member of Iran's Islamic Revolutionary Guard Corps - Quds Force.

The U.S. military calls the force "a covert action arm of the Iranian government responsible for aiding lethal attacks against the Iraqi government and coalition forces."

The military said the Quds Force suspect was involved in bringing roadside bombs from Iran into Iraq and in training foreign terrorists in Iraq.

The man, captured in the Iraqi Kurdish city of Sulaimaniya, is one of several Iranians in U.S. custody in Iraq.

Also on Thursday, an Iraqi National Police intelligence officer was taken into custody for "suspected involvement in illegal militia activities," the U.S. military said.

Col. Thamir Mohammad Sinah al-Husayni, also known as Abu Turab, was arrested by U.S. troops...