There us this breaking news:
http://www.sott.net/article/300083-Massive-explosion-reported-in-Chinese-city-of-Tianjin
Still not much is known about the explosion, but another site says the following:
It might be it, but then in the video it's possible to see that there was a fire (that's why the guys started filming) and only then it exploded. Wonder why they don't mention it. But maybe it's because this particular user didn't see the fire?
http://www.sott.net/article/300083-Massive-explosion-reported-in-Chinese-city-of-Tianjin
Still not much is known about the explosion, but another site says the following:
State broadcaster China Central Television reported on its official microblog that the blast erupted in a shipment of explosives at a container berth in the Binhai New Area at about 11.30pm on Wednesday.
“All of a sudden there was a flash of big red light, and a big sound,” one online user who claimed to live near the blast site said. “And 10 seconds afterwards, there was a big wave.”
It might be it, but then in the video it's possible to see that there was a fire (that's why the guys started filming) and only then it exploded. Wonder why they don't mention it. But maybe it's because this particular user didn't see the fire?