The BBC is reporting that a woman of Pakistani origin has been found with liquid that tested positive for explosives:
http://news.bbc.co.uk/1/hi/world/americas/5261456.stm
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West Virginia airport terminal evacuated after bomb dog reacts to suspicious liquid in luggage
By the Associated Press
August 17, 2006
CEREDO, W.Va. -- A West Virginia airport terminal was evacuated Thursday afternoon after a bomb-sniffing dog reacted to a bottle filled with a liquid in a passenger's luggage, an airport official said.
A screener noticed the bottle in a woman's carryon bag as she prepared to board a flight to Charlotte, N.C., said Tri-State Airport authority President Jim Booton.
The woman was detained for questioning, commercial airline service was temporarily suspended, and about 100 passengers and airport employees were ordered to leave the terminal, Booton said.
At least one flight was diverted to Charleston's Yeager Airport, about 60 miles away.
The FBI is investigating.