Two Palestinians were Tuesday killed, while others injured, in an Israeli strike in the town of Beit Lahia, north of the Gaza Strip.
"The people who it harms the most are the residents of Gaza", Zamir said.
The announcement, cleared by Israeli censors who had previously barred reports of detection work around the central Gaza frontier, followed a surge of Palestinian unrest in response to last week's United States recognition of Jerusalem as Israel's capital.
The destruction of the tunnel did not lead to any deaths, Manelis said, adding that even if there were he was "not sorry", and that Israel will continue to take all measures at its disposal to destroy any cross-border tunnels. A third rocket was intercepted by an Iron Dome system.
The tunnel destroyed on Sunday ran hundreds of meters into Israeli territory and, though unfinished, was a new project that showed "a significant effort by Hamas", military spokesman Lieutenant-Colonel Jonathan Conricus told reporters. Two were shot dead by the Israeli army while protesting, while two others died in Israeli air strikes in response to rocket fire from Gaza.
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The rocket, fired at about 11:30 p.m., triggered early warning sirens in Ashkelon, the Lachish region and in the area around the Gaza Strip.
Two weeks ago, the group fired 12 projectiles aimed at an IDF post and a cement factory on the northeastern edge of the Gaza Strip where construction crews are working on Israel's new underground barrier with the Strip. The Iron Dome Aerial Defense System intercepted a rocket above the city.
In retaliation, Israel targeted a number of Hamas positions, killing two Hamas terrorists.
On Sunday, the Israeli forces destroyed Hamas tunnels in Gaza, however, announcing that the operation hasn't been linked to the recent clashes between Palestinians and police.