Probably from the same evil Teabagging smuggler who smuggled those M-88 firecrackers into New York from Pennsylvania, where all those bitter clingers live! It's been pretty well established that all violent crime in N'Yawk is perpetrated in absentia by less sophisticated but nonetheless scary rightwingers who sell evil things to the otherwise peaceful and diverse N'Yak community.
Nonetheless, I'd like to see more attention paid to where this guy actually obtained those UNREGISTERED propane tanks, how did that happen?