I have never read the Quran, but I had heard from people who did that the Islam teachings state that Islamic captors should not harm their prisoners. This article from the Kashmir Herald, a Hindu newspaper, may be biased against Islam but it seems that the references the author uses are authentic and carry at least some authority in the matter.
Islam and prisoners of war
I do not favor of one religion over another, so don't think I'm trying to bash Islam or something like that but the recent murder of
Nicholas Berg made me think how the two could be lined up with each other.
We live in difficult times.