About an hour before the plane landed, several U.S. fighter jets were scrambled to escort the airliner into Dulles, said British Airways spokesman John Lampl.
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....FBI spokeswoman Debbie Weierman.
"Some of the passengers' names were folks that law enforcement officers were interested in speaking with," Weierman said. "And when the flight came in, those folks were interviewed." Weierman said no one was arrested.
Jennifer Marty, a TSA spokeswoman, said there was no specific incident on board that prompted the investigation.
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Mark Hatfield, a TSA spokesman, said the aircraft was directed to a remote part of the airport and thoroughly inspected, including a bag-by-bag search of all luggage.
"We were very interested in that particular flight, based on intelligence," Hatfield said.
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Since the threat level was raised, officials said that several international flights have been similarly screened, including at least one other airliner at Dulles.