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(CBS) CBS News Correspondent Bob Orr reports the Department of Homeland Security has issued an alert that warns customs officers at six of America's busiest airports to watch for travelers of Pakistani descent who show physical signs of preparing for terror attacks against the U.S.
The bulletin says, "Officers should look for rope burns, unusual bruises, wounds/scars or other evidence that they engaged in paramilitary training..."
Homeland Security also looked into the backgrounds of 2.7 million truck drivers licensed to carry hazardous materials, Murphy said. Of those, 29 had possible relationships with terrorist organizations and are being investigated further, he said.
He declined to provide further details.