[Joe Hadenuf]

I would bet it was natural gas explosion, the only problem here is the amount of fire after the explosion. And there was a lot. From the NG explosions I have seen, its usually such and intense explosion that it blows out any flame or fire. A lot of fire was associated with this incident.

[The Magical Mischief Tour]

Fox is confirming the secondary explosions via the LAFD!!!

[CELTICGAEL (Celt)]

Per CNN bomb squad is probing the condo.

[philetus]

Now they (Foxnews) are interviewing a witness across the street and he is saying someone was barbaquing inside the apartment with a gas grill, so I guess a 5 gal. gas bottle blew the whole place apart.