OK city may be spot on.
I'm no ex-pert, but the shock wave looks kinda subsonic like a low explosive to me. like NH4NO3 for example.
Quote:
Lebanon’s interior minister said initial information indicated highly explosive material, seized years ago, that had been stored at the port had blown up. The minister later told Al Jadeed TV ammonium nitrate had been in storage there since 2014.
Footage of the explosion shared by residents on social media showed a column of smoke rising from the port district followed by an enormous blast, sending a ball of white smoke and fireball into the sky. Those filming the incident from high buildings 2 km (more than a mile) from the port were thrown backwards by the shock.
Lebanon’s health minister said more than 25 people had been killed and more than 2,500 were injured. Lebanon’s Red Cross said hundreds of people had been taken to hospitals.
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https://www.oann.com/large-blast-in-beirut-port-area-shakes-lebanons-capital-sources-say/