 So they found explosive devices in Mr. Crooks' car, so it could have been worse. On Sunday, a clue as to how Mr. Crooks may have trained in the use of firearms. The Clareton Sportsman Club, a wooden facility south of Pittsburgh that features a 200-yard rifle range, confirmed that Mr. Crooks had been a member. The club is unable to make any additional commentary in relation to this matter in light of pending law enforcement investigations.