Withdrawing the photos sounds like a "clean-up" effort, but I really doubt that is the actual purpose.
I suspect Reuters wants to make it harder to find more of the fakes this guy is responsible for. Find too many fakes and people might start looking at OTHER Reuters stuff as well...
Well there were two other guys from Reuters in Qana taking pictures. Their names are Ali Hashisho and Zohra Bensemra Maybe we should check them out too. You know--birds of a feather...