IDF Uncovers Second Hamas Attack Tunnel– Yaakov Lappin (Jerusalem Post)
The IDF uncovered another cross-border Hamas attack tunnel stretching from Gaza into Israel on Thursday, located 30 meters underground, following the discovery of a deep Hamas attack tunnel in April.
A senior security source said Hamas understood that the IDF had begun approaching its tunnel and tried to stop Israel through mortar fire.
The IDF said, “This tunnel was dug by the Hamas terror organization to carry out attacks in Israeli territory against Israeli civilians and security forces.”
See also Israel Returns Fire after Hamas Shelling of IDF Units Detecting Tunnels – Yaakov Lappin (Jerusalem Post)
Hamas launched a series of cross-border mortar attacks targeting IDF units on the border with Gaza on Wednesday, prompting the IDF to return fire with tanks and air strikes on Hamas targets.
The escalation was the most significant since the end of the summer 2014 Gaza war.

Shin Bet announces arrest of Hamas tunnel expert

Times of Israel, May 5, 2016

The Shin Bet announces the arrest of a Hamas terrorist who it says has provided a great deal of information about the group’s tunnel activity.

Teh security service says 29-year-old Mahmoud Atawnah of the Hamas armed wing was arrested at the start of April when he crossed the Gaza border fence into Israeli territory, armed with two knives. During his investigation, Atawnah tells Shin Bet officials that he intended to kill Israeli soldiers or civilians.

The information from Atawnah includes details of tunnel routes in northern Gaza, Hamas excavation methods and the group’s use of homes and institutions to hide both tunnel mouths and weaponry.

— Ilan Ben Zion