He demanded that those behind the act be tried. "The way these collaborators were killed and the images after their death are totally unacceptable and those responsible must be indicted. These events must never repeat themselves," he wrote.
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Abu Marzook further added, "We endorse punishments to spies and especially to those who took part in the death of our commander and undermine our resistance but they should only be punished by law."
Palestinian gunmen shot dead six alleged collaborators in the Gaza Strip who "were caught red-handed," according to a security source quoted by Hamas' Aqsa radio on Tuesday.
"They possessed hi-tech equipment and filming equipment to take footage of positions," it said.
The Hamas radio said the men, who were suspected of working for Israel, were shot. It did not elaborate.
Gunmen chained the body of one of the alleged collaborators to a motorcycle and dragged it throughout the main streets of Gaza City.
This was the second time collaborators were reportedly killed in Gaza since the beginning of Operation Pillar of Defense.
Palestinian and foreign officials reported Friday that a man, who was killed by gunmen in Gaza, had a banner tied to his neck accusing him in collaborating with Israel and causing the death of 15 Palestinian officials.
The Palestinian news agency reported that since Hamas took over the Gaza Strip in 2007, the government has conducted 14 official executions. In September of 2012 a Gaza court sentenced to death a man who was convicted in collaborating with Israel.
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