NEW : Gabrielle Giffords parents took away his shotgun and told him he needed help . NEW : Loughner bought seven or six boxes of ammunition , documents show . NEW : He purchased 9mm before Wednesday , investigators say . NEW : He was probably getting tired of me asking if he was OK , '' Forney said . Loughner ran from parents just before the shooting rampage , mom says .
NEW : Gabrielle Giffords parents took away his shotgun and told him he needed help . NEW : Loughner bought seven or six boxes of ammunition , documents show . NEW : He purchased 9mm before Wednesday , investigators say . NEW : Loughner ran from parents just before the shooting rampage , mom says .