TO GO WITH AFP STORY BY ADEL ZAANOUN Palestinian militants from the Islamic Jihad's armed wing, the Al-Quds Brigades, squat in a tunnel, used for ferrying rockets and mortars back and forth in preparation for the next conflict with Israel, as they take part in military training in the south of the Gaza Strip on March 3, 2015. Israel's ground invasion during the 50-day war with Palestinian militants in the summer of 2014 was aimed at destroying the hundreds of tunnels Gaza's two main Islamist groups had built, both for smuggling supplies and for attacks inside Israel. AFP PHOTO / MAHMUD HAMS (Photo credit should read MAHMUD HAMS/AFP/Getty Images)