<p>WASHINGTON — U.S. forces in Iraq believe they may be facing an Al Qaeda cell in Fallujah after a man with suspected ties to the terror network was captured last week, sources told Fox News Friday.</p>
<p>The man said to have been arrested was Husam al-Yemeni, said to be part of the leadership structure of Ansar al-Islam (search), the Al Qaeda-associated terrorist group based in Iraqi Kurdistan. Some U.S. officials described al-Yemeni as the first Al Qaeda operative captured in Iraq.</p>