over the place, extensive damage also done to the building. joe johns joins us from washington. three days now, joe, since aaron alexis went on that rampage. we're hearing about strange etchings on his gun. what do you know about that and the investigation into a motive? >> reporter: michael, a lot of bits and pieces today. the more that's uncovered about the navy yard shooting suspect aaron alexis's life the more difficult it becomes for investigators to uncover a motive for the deadly massacre. this morning, a law enforcement official said that, among the many puzzling things investigators have turned up on the 34-year-old navy contractor is an online alias he created in the name of mohammed selem, they found no indication he was interested in jihad or religion interest other than dabbling in buddhism. alexis etched phrases into the shotgun he used but investigators don't know what to