The Israeli intelligence agency, Mossad, is believed to be behind an audacious operation that involved packing thousands of Hezbollah pagers with explosives and distributing them to the group's members across Lebanon. The pagers were used by senior Hezbollah officers, and when an unknown message was received, the devices exploded, causing significant casualties. The operation is being described as Hezbollah's 'biggest security breach' and has dealt a major blow to the group's leadership. The attack has raised tensions between Israel, Lebanon, and Iran, with fears of potential retaliation.