new terror plot from down at one of the busiest construction site on earth. if that s all it were, a construction site, it would be remarkable. it s much more than that. along with a new transportation hub and two enormous skyscrapers up behind me, there s a remarkable memorial, the 2,606 people killed here almost ten years ago. and ten years later, all over manhattan, washington, d.c., there are echos of that terrible day. police and troops and the assault rifles and the train stations, the same as it was. check points and roadblocks pulling over trucks and vans and the anniversary to breaking news tonight. new developments of the potential plot targeting new york and washington. two of the three people thought to be connected to it are american citizens. susan candiotti working her sources. she joins us now. and a volunteer for george w. bush, and national security analyst, peter bergen. last night we thought it was just one person was a u.s. citizen, now we re hearing two.