Information from the US military on the incident followed unconfirmed claims four Italians and two Americans had been captured.
A CNN report today said several American civilians were also unaccounted for in Iraq.
The Italian government said it had no reports of any citizens missing.
Three Japanese are being held captive in Iraq, and a Canadian, an Arab Israeli and a Briton are also missing.
Yesterday, Foreign Minister Alexander Downer said Australia would not bow to terrorist demands even if the estimated 30 Australian civilians working in Iraq were taken hostage.
In Baghdad today, coalition spokesman Dan Senor said: “We will not negotiate with any terrorists that take hostage of any individual, and we will seek to capture or kill them.”
