A number of commenters to the article claim to have witnessed those very events. One said that he saw Hamas stop an ambulance with 17-year old Jihad Duhan, who had a bullet wound in his foot, and shoot him in the head.
Another commenter said that he saw 22-year old Abdullah Awadallah murdered in the hospital he was being treated in.
PalPress is very anti-Hamas, but in general a high percentage of their anti-Hamas reports end up being corroborated. It is hard to know how accurate the comments are but the names mentioned were indeed of people killed during the mini-war.
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