. >> could you explain for members of the publy w llic why it is s important find out what he was doing during the two and half hours. >> just confirming in the fact that he was a solo player. did he have conversations with people that fleshed out his motivation. what was going on in his mind in these last two hours of his life. they have done a great job following him from maryland up to the atlantic terminal and then he dumb ps the phone and w loose it. >> we owe it to the family to find out what happened. that is our main concern. i had to explain to his mother, and father and the family, very difficult to do. we owe it to them to find out exactly what happened. we also need other witnesses to see if he told anybody before hand. so we're seeking to build this case up so we know going forward exactly who talked to this man and may have stopped him. >> let me just add, first, the point that i think here that again the commissioner said there had been copy cat threats, anything like that needs to be taken very serious. the simplest thing any new yorker can do is call 9-1-1. if you hear