A United Airlines 757 was taxiing for takeoff from San Francisco International Airport on Tuesday when a flight attendant reported a "pungent chemical odor" emanating from a carry-on bag. The pilot parked the aircraft at a remote location, 181 passengers were bused to the terminal for re-screening and law enforcement officials swept the plane. After a six-hour delay, the flight was allowed to depart when authorities determined the smell was caused by Chinese herbs carried on board by an elderly couple arriving from overseas.

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