ROUGH CUT (NO REPORTER NARRATION)<br/> <br />The gunman who shot and killed two people at a Maryland mall was a 19-year-old man who lived with his mother in the city of College Park and arrived at the shopping center in a taxi about an hour before opening fire, police said on Sunday.<br/> <br />But a day after Saturday's shootings, police could provide no immediate insight into why Darion Marcus Aguilar killed a young man and a young woman at the mall in Columbia, Maryland, about 20 miles (32 km) west of Baltimore, before apparently killing himself.<br/> <br />Police have yet to find any ties between Aguilar and the two people he killed, employees at a skateboarding shop at the mall, Howard County Police Chief Bill McMahon told a Sunday morning news conference.<br/> <br />"We do know that one of our victims also lived in College Park," McMahon said. "We don't know if there's any connection there or whether that's merely coincidental."<br/> <br />Aguilar fired six to eight shots from a 12-gauge shotgun, killing
