captions paid for by nbc-universal television . and good morning. welcome to today on a wednesday morning. i m matt lauer. i m ann curry. this shooting in carson city, nevada, was a real tragedy. police say they still can t find a clear motive to explain it. a lot of people saw what happened. witnesses say the 32-year-old gunman walked in armed with an a krak ak-47 assault rifle and simply opened fire. some of the shots in direct aat a table of uniformed national guards troops. moments later suspect took his own life. straight ahead, the latest on the investigation and what the shooter s family is saying this morning. and also ahead, some major developments overnight in the murder appeals case of ayman ma knox. could she go free soon? also, we have an exclusive live interview with new york city s mayor michael bloomberg. he s going to share his thoughts on this sunday s tenth anniversary of 9/11 and what it will mean for him to participate in the memorial. we n