Gaza Health Ministry spokesman Ashraf Al-Qidre named three of the dead as Ahmad Khalil Abu Armana, 25, Omar Nasar al-Fallit, 27 and Musbah Shabir, 30. The military had been monitoring it for "some time", Conricus said, declining to say when it was first discovered. He added that the IDF had good intelligence on the tunnel's outline and it did not pose an immediate danger, however, in the end, it was decided it would be preferable to attack it.
Security officials, who spoke on condition of anonymity, said the Israeli army bombarded with bombs a tunnel underneath the borderline area between southeast Gaza Strip and Israel.
"The deal that we signed with Hamas talks about building a Palestinian state on the June 4, 1967, borders - which is in line with global law", Qawasmeh said when asked the comments made by Jason Greenblatt, the U.S. president's special representative for worldwide negotiations.
"The IDF will continue to use all measures at its disposal above and below the ground to thwart attempts to harm the residents of the State of Israel and to maintain the relative quiet in the area achieved after Operation protective Edge", the army said, referring to the 50-day conflict fought between Israel and Hamas in 2014.
Earlier this month, Hamas reached a national reconciliation deal with Abbas's Fatah party with the aim of ending a decade-long political rift mainly over the governance of the Gaza Strip.
The tunnel was reportedly discovered around two weeks ago, and prompted the United Nations agency to close the school while it sealed the tunnel's opening.
The Israeli army said it carried out what it called "a scheduled detonation of a new tunnel, which was still under construction, near the border fence".
"This is a severe violation of Israeli sovereignty and must not be overlooked", an IDF spokesman said.
Greenblatt also said that, in contrast, a rare meeting between top Israeli and Palestinian leaders in the West Bank yielded "meaningful steps" that strengthened economic ties between the two sides.
Finance Minister Moshe Kahlon met with Palestinian Authority Prime Minister Rami Hamdallah to discuss a range of joint economic projects.
In a statement, the Palestinians said they protested Israel's recent settlement expansion.