U.S. Hunts for Citizens Training With Terror Groups

LOS ANGELES - "The top U.S. diplomat in Pakistan said Friday that the Obama administration does not know how many Americans might have disappeared overseas to train with Al Qaeda or other terrorist groups, but the number is not thought to be large.

Speaking to the Pacific Council on International Policy in Los Angeles, Ambassador to Pakistan Anne Patterson outlined a "nightmare scenario" in which people holding U.S. passports receive terrorist training then return legally to the U.S. to commit violent acts.

"They can easily infiltrate back into the United States and, frankly, we don't know what to do about them," Patterson said. "We think there are more out there than we know about."

"We just have to keep working at it," she said."