The family of a Hamas man who was executed by the group’s armed wing on Sunday is demanding an investigation into the execution, saying their son was innocent.

A number of Palestinian human rights groups have also called for an investigation into the execution of Mahmoud Eshtaiwi, a senior member of the military wing of Hamas, Izzadin Kassam.

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Izzadin Kassam announced that Eshtaiwi was executed for “moral and behavioral transgressions.” The group did not provide further details.

Eshtaiwi, a top Izzadin Kassam commander, was arrested more than year ago. He was in charge of a number of Hamas tunnels in the eastern part of the Gaza Strip.

Shortly after his execution on Sunday afternoon, his family issued a statement in which it expressed shock and called for an investigation into the case.

The statement said that he was innocent and had fallen victim as a result of a dispute between him and his commander, Ezaddin al-Haddad.

“We affirm that our son is completely innocent and what happened was part of an internal settling of scores,” the family said. “Our son was executed after Izzadin Kassam failed to prove any of the charges against him.”

The family said that the execution was carried out two hours after its representatives met with Hamas leaders, who promised to find a solution to the case.

Human rights groups in the Gaza Strip condemned the execution of the Hamas man as a “breach of the rule of law” and called for an immediate investigation.

The groups expressed concern that the execution would plunge the Gaza Strip into a state of anarchy and lawlessness.

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