2 massive blasts apparently measuring 2.3, then 2.9, in magnitude on the earthquake scale, hit Tianjin a few hours ago at 11:30 pm Wednesday (US Time). Apparently, they originated in a port warehouse where explosive materials were stored and the blasts traveled through city sewers to wreak damage in a wide radius.
CNN Video of the blasts
Vine of blasts by SkyNews
The New York Times reports that a truck driver living a mile away, said, “The air pressure from the blast was so strong it just knocked me down in one fell swoop.”