I’m with you, immediately thought Meth Lab.
I mmediately thought it was a Japanese restaurant because instead of wildy speculating here on FR, I did a google search on the address and found that there indeed is (was) a Japanese restaurant at this address. Later confirmed by an eywitness who describe the aftermant in a clear cohernet tone to a WABC reporter who was trying to goad him in to being emotional. What were you feeling?
Fist video I saw was a hysterriaal woman screaming about the chaos.