saturday's terrifying shooting at this mall in columbia, maryland. >> darion aguilar is the shooter. >> police still aren't talking about a possible motive, though they say 19-year-old aguilar lived in the same college park neighborhood as one of the victims, 21-year-old benlolo. >> we haven't been able to verify a relationship between him and either victim. we can't establish there is one. we can't establish there is not one. that is an open question. >> surveillance videos, police say, reveal that aguilar arrived by taxi at this upper-level mall entrance around 10:15 saturday morning walking by a children's carousel and carrying backpack with two home made devices. over the next hour, they say, he went downstairs and back up into skateboard shop, where worked by other picture.