He apparently dug deep enough to get into the hole and then be suffocated by the walls collapsing on him.
The boy was pretending to be a Hamas member.
(h/t Bob Knot)

Buy EoZ's book, PROTOCOLS: EXPOSING MODERN ANTISEMITISM
If you want real peace, don't insist on a divided Jerusalem, @USAmbIsrael
The Apartheid charge, the Abraham Accords and the "right side of history"
With Palestinians, there is no need to exaggerate: they really support murdering random Jews
Great news for Yom HaShoah! There are no antisemites!