It was taken very seriously. There was no way of knowing it was a hoax. It had to be treated as if it were anthrax or some other poison.

We approached the residence and announced ourselves. The female occupant refused to open the door. After a brief verbal standoff we gained entry and Dow was arrested without incident.

Leung did talk to the FBI as a complainant. The FBI found no evidence to corroborate the allegations made by Leung.

It certainly could have been.

It was a combination of technical and human intelligence that led us to him.

We took this threat seriously. We tried a number of avenues and we asked for his assistance in trying to corroborate the threats. But we were unable to produce enough information.