The alleged gunman charged with slaughtering 10 people at a Colorado supermarket bought an assault rifle a week prior to the shooting — and was caught “playing” with it by a family member, according to new court documents. Ahmad Al Aliwi Alissa purchased a Ruger AR-556 pistol on March 16 — six days before going on a deadly rampage at the King Soopers in Boulder, according to an affidavit unsealed Tuesday. His sister-in-law, whose name is redacted, told investigators that she saw Alissa, 21, “playing with a gun she thought looked like a ‘machine gun'” in the days prior to...