Sky News Arabia quotes sources saying that yesterday's large-scale pager attack in Lebanon was possible because the Mossad spy agency got hold of Hezbollah’s communication devices before they were handed over to the terror group.

The Israeli spy agency placed a quantity of PETN, a highly explosive material, on the batteries of the devices, and detonated them by raising the temperature of the batteries from afar, the source says.
The Wall Street Journal reported earlier that some Hezbollah members felt their pagers heating up and disposed of them before the series of explosions that killed at least nine and injured about 2,800 people.

This video appears to be one such case
source: timesofisrael.com