3:26 PM PT -- Lebanon's prime minister, Hassan Diab, says the explosions were caused by 2,750 tons of ammonium nitrate that had been sitting unsecured for 6 years in a warehouse ... and he's vowing to punish officials deemed responsible.
For context, the Oklahoma City bombers used 2 tons of ammonium nitrate to build the bomb that blew open the Alfred P. Murrah Federal Building way back in 1995, a deadly explosion that killed 168 people.
2:51 PM PT -- The death toll is now a reported 73 with at least 2,750 injured.
2:07 PM PT -- Here's video of a church service being disrupted by the blast, which sent folks running as stained glass windows rained down from above.
Church services are being televised in Lebanon due to the pandemic, and people watching mass from home saw the destruction to their place of worship.
12:02 PM PT -- Lebanon's Minister of Health says at least 30 people are dead and around 2,500 injured from the explosion.
Beirut looks like an atomic bomb went off, after a massive explosion rocked the city and left hundreds of people severely injured.
Several videos captured the terrifying moment Tuesday in the Lebanese capital -- where, at first, a port-adjacent building simply appeared to be on fire with smoke billowing up.
Suddenly, a massive explosion erupted from the site ... sending a huge mushroom cloud into the air ... along with debris and shockwaves.
It immediately engulfed the area ... and people were screaming in horror at the sight. The scene was frighteningly similar to watching the Twin Towers fall on 9/11 -- although it's unclear yet if the Beirut explosion was a terrorist act.