The investigation will focus on whether the Marines followed procedures to properly fire the weapon, whether there was a malfunction in the firing device or in the explosive mortar itself, the official said.

NPR: Mortar Explosion In Nev. Kills 7 NC Unit Marines

"Despite the efforts to focus on Saddam's desires and intentions, the bottom line is Iraq did not have either weapon stockpiles or active production capabilities at the time of the war, " Rockefeller said in a press release.

CNN: Report?fuels Iraq WMD debate