Abdullah (C-top), the son of Mohamed al-Astal, a member of the Ezzedine al-Qassam Brigades, the military wing of the Palestinian Islamist movement Hamas, kisses his father's forehead during his funeral in Khan Yunis in the southern Gaza Strip on March 4, 2016. Al-Astal was killed in the collapse of a Gaza tunnel. His death brought to 12 the number of Gazans killed in five separate tunnel collapses since January 26, 2016. / AFP / SAID KHATIB