Lebanon’s interior minister says initial information indicates highly explosive material seized years ago blew up, though the cause of explosion won’t be determined until an investigation is complete - Reuters
Nothing to see here folks, move along.
Apparently there’s documentation the Port warned the Beruit Council for years of the danger and it needed to be re-located away from the city or the destruction we now see would happen.....
I understand this stuff can self-ignite over time. But as you stated the investigation will show what happened. However, how their findings are reported could well be another story.