As if we needed any further reason to whack any Iranian

found in Iraq, check this out from Q&O on the attack in Karbala:
Mahawil is in Babil province, about 27 miles directly west of Karbala. While it is impossible to prove, the attackers may have been making a bee-line towards the Iranian border.

The Karbala raid makes sense in light of the U.S. raids on the Iranian diplomatic missions in Baghdad and Irbil, where Iranian Qods Force agents were captured, along with documentation that divulged Iran's involvement with and support of Shia death squads, the Sunni insurgent, and al-Qaeda in Iraq and Ansar al-Sunnah. Five Iranians from the Irbil raid are still in U.S. custody, and captured U.S. soldiers would provide for excellent bargaining chips

IF it is confirmed that Iran's Qods Force was responsible, the news that the United States has authorized the death or captured of Iranian agents inside Iraq, as well as in Afghanistan and Lebanon makes all the more sense.

We've already found Iranians and newly Made-In-Iran equipment in the hands of the tangos; we didn't NEED anything further to 'authorize the death or capture of Iranian agents'. If the previous crap didn't count, THIS should count as an 'act of war' against us and Iraq.