Did you get to see this reply "A rebel-allied cleric who goes by the name Sheik Rafaa told Knight Ridder that Iraqi rebels were so infuriated by the disappearance of their foreign allies that one cell had "executed 20 Arab fighters because they left an area they promised to defend."
Were you speaking in theory of all those terrorist, hostages and hostage holders being all foreigners, or foreigner terrorist being taken hostage and executed by rebel Iraqi (Iraqi insurgents)?
Maybe this article posted earlier might add to the discussion
http://interestalert.com/brand/siteia.shtml?Story=st/sn/11120004aaa01986.upi&Sys=siteia&Fid=WORLDNEW&Type=News&Filter=World%20News
Also two other earlier repliers wondered if any of those killed execution style were either Sheik Abdullah al-Janabi or Omar Hadid.
From an earlier article "Many insurgents apparently fled from Fallujah" from MSNBC (don't know if this one was posted in freerepublic) was this sentence... "There were unconfirmed reports that two top insurgent leaders, Sheik Abdullah al-Janabi and Omar Hadid, had been killed."
Hope this info helps.