For millions of Lebanese, this week’s mass explosion of pagers and walkie-talkies, with its bloody aftermath, is painfully similar to the horrific explosion four years ago of haphazardly stored ammonium nitrates that tore through Beirut’s port,

Just as crowds had gathered to mourn some of those killed in Tuesday’s wave of pager-bomb attacks, an explosion sparked chaos in Dahiya, Hezbollah’s stronghold in southern Beirut. A video captured the blast, showing a man lying on the ground and panicked people, some screaming, running away.