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.

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.

It was a journal, and somebody had handwritten in this journal 'suicide bomber. The other thing he was doing was clutching a backpack.