There were about 2,800 injuries, many of them serious, and at least nine fatalities.
Although Israel is Hezbollah’s enemy, it is unknown how the attack, which appears to have been very sophisticated, happened. So far, no comments have been made by Israeli officials.
Here’s what we currently know.
Where and when did it take place?
Tuesday at approximately 15:45 local time (13:45 BST), explosions started in Beirut, the capital of Lebanon, and a number of other parts of the nation.
Witnesses reported hearing small explosions that resembled fireworks and gunshots, then seeing smoke coming out of people’s pockets.
CCTV footage appeared to show an explosion when a man was standing at a checkout counter in one shot.
Following the initial explosions, explosions persisted for around an hour, according to the Reuters news agency.
Numerous patients started showing up in hospitals all around Lebanon shortly after, and witnesses described scenes of widespread confusion.
