Already did, Paul, and if you are alleging the police fired a shot at the canister  show us the film as the incident is supposed to be on several camera phones. Our department had already made such tests of propane canisters after a use of flash bang in Mat/Su around 85. Had a guy in Fairbanks in early 70's blind himself using blasting cap on propane bottle.

Anyway lets see what real evidence comes out.