Israel has revealed more details about how 21 Israeli soldiers died in a single incident in Gaza on Monday. The IDF says the reservists were planting explosive mines to blow up two buildings in eastern Gaza. During a firefight, Hamas militants hit one of the mines, setting off a chain reaction that toppled the buildings with Israeli troops trapped inside. Israel says the buildings were being leveled to create a so-called buffer zone in eastern Gaza. The Intercept reports this appears to be the first time the Israeli military has publicly admitted that it’s systematically destroying whole areas of Gaza with the intent of depopulating the area.