by Dan Gibson
From the Wall Street Journal:
Arizona shooting suspect Jared Lee Loughner was turned away from a Walmart store when he tried to buy ammunition, but was sold the bullets at another Walmart nearby, hours before the rampage, according to people familiar with the matter.
Federal investigators probing the shooting are focusing on the sequence of Mr. Loughner's actions as they try to establish that he was acting with some planning despite his apparent mental-health issues, according to these people.
It was unclear what caused the first Walmart store clerk to turn Mr. Loughner away that morning.