An American Airlines jet was held on a remote section of tarmac at San Francisco International Airport for several hours Thursday due to a hijacking threat. Police boarded the plane through a rear door and removed two passengers for questioning. Other passengers were then allowed to exit six at a time for additional screening before being bused back to the terminal. "The two passengers were taken off the plane separately, but we cannot discuss the specifics why," an FBI spokesman said, and the agency determined that the threatening phone call was "non-credible." The couple told a reporter they were selected at random for questioning, but a fellow passenger said they were traveling on Pakistani passports and may have been singled out.
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