The teenagers weren't thinking about last-minute holiday purchases when they pulled into the Montgomery County shopping mall two days before Christmas. Instead, one of the teens later told police, the group went to the crowded mall to randomly shoot someone. All four, including a 14-year-old girl, are members of the Bloods street gang in Prince George's County, authorities said. Two of them opened fire in the parking lot of Westfield Wheaton Shopping Centre when they spotted members of a rival gang, police said. In announcing the arrests yesterday, county police said the four were being held on charges of attempted...