BAGHDAD, Iraq (CNN) -- A top special operations officer from Lebanon's Iranian-backed militia Hezbollah has been captured in Iraq, where U.S. officials say he played a key role in a January attack that killed five Americans...

This could get interesting. The U.S. has, to a large extent, left Hezbollah alone. Are we seeing the emergence of a violent, trans-ethnic Shiite axis? If so, does that undercut our policy of supporting the existing government of Iraq?