In the first frantic moments, police struggled to figure out just what was going on inside the American Civic Association, let alone who was carrying out the attack. Early on, a car blocking an exit led to a license plate number and a name and address.

”Check with JCC if they have anything on him, any intel.”

A family name would aid police in their investigation since the key source, Jiverly Wong himself, would not survive the attack.

”Guy at the back door says he thinks the assailant shot himself.”

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The first real breakthrough came with the receipt of this letter. A look inside the tortured mind of Jiverly Wong. And it will take time to figure out just what the message of Friday was.

“In this case, we're going backwards and we're just trying to put together the pieces,” said Diana Falkenbach of the John Jay College of Criminal Justice.

The letter now is in the hands of FBI experts

“There's obviously some mental health issues there. We saw some religious overtones. They're the experts and the people they contract with are the experts to tell us exactly what that letter means,” said Binghamton Police Chief Joseph Zikuski.

The pictures accompanying the letter may help give some background. From the similarity of furnishings in a break room, it appears they were taken at the Binghamton Rifle Club, where Wong may have gone to hone his shooting skills. And there is still work underway on why the civic association? And why these people?

“There were people in that classroom that were in the class when he was there. Personal relationships? Obviously, that's important to us and we're following every lead to see if there is any connection between him and anybody in that room, because, obviously, that would go towards motive,” Zikuski said.

Many more answers to seek before the case is closed.