There's not a lot of word on this, but Fox News is reporting that "Hostage Slaughter Houses" have been discovered in Fallujah. These are houses where groups of hostages were taken and mass slaughtered. As more word comes in I'll provide news links.
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Update (10:00 AM PST)
Chad over at In The Bullpen tipped me to the AP article below on the slaughter houses. Thanks Chad.
Iraqi troops have found "hostage slaughterhouses" in Fallujah where foreign captives were held and killed, the commander of Iraqi forces in the city said Wednesday.
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Mohan did not say that remains of captives were found and did not comment on whether the houses were believed linked to al-Zarqawi or any of several other militant groups that have claimed kidnappings.
"We have found hostage slaughterhouses in Fallujah that were used by these people and the black clothing that they used to wear to identify themselves, hundreds of CDs and whole records with names of hostages," the general said at a military camp near Fallujah.
Rusty of The Jawa Report and
James Joyner of Outside The Beltway also reporting.