It said Ahmed Mayyat was killed and three others were injured today without elaborating.
Mayyat was a local contractor hired by the Islamic Jihad to remove a bomb from the tunnel, the group said. Local media reported he also worked for several international aid organizations in Gaza on a freelance basis.
Gaza militants have used underground tunnels to attack Israelis during the 2014 war.
Israel is building a massive underground barrier along the Gaza border to defend against the tunnels.
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