Which chemicals are the source of combustion in a Meth Lab?

I am doing a presentation on harmful exposures during the production of methamphetamines, but I don't know which of the chemicals pose the greatest fire hazard, and which ones are the ones that tend to cause the explosions.

Thanks!

: http://alcoholdrugstreatment.info/which-chemicals-are-the-source-of-combustion-in-a-meth-lab