The report that Russpogi posted indicates that there was a "firecracker sound BEFORE the big explosion" which is inconsistent with an LPG explosion.

I've seen and heard an LPG explosion before and it there are no cracking sounds before, during or after an explosion. It's just a loud BOOM plus the sound of buckling metal.

Based also from the extent of the damage I've seen sa news, the blast was too powerful for even two large LPG tanks. The explosion was also directed upwards, if it were gas it would have been concentrated sidewards. I really hope that my hunch is wrong because this is freaking scary.

Malapit pa naman ang pasko at marami ang magpupuntahan sa mall.