Allow me to fininsh the sentence...
"...from inside your a$$ 20 feet away!"
TATP is so damn volatile...any "engineering" student would have access to the chemicals that make more stable explosives...hell ANFO would be commonly available and producable.
TATP is the signature of the Islamazis though...maybe that mosque was where he was attending some "extracarricular" training!
Time for a new childhood saying...nice and preventative!
"See a Mosque; blow it up!
And then Mohammed's out of luck!"
for the ping list...
He tried to buy a lager quantity of ammonium nitrate a few days before his demise.