COLUMBUS — An overheard passenger's comment that a prohibited item had passed undetected through a security checkpoint prompted an hour-long evacuation of a Port Columbus International Airport concourse, a federal transportation spokeswoman said Thursday.

        The Transportation Security Administration ordered the concourse emptied about 5:45 p.m. Wednesday so passengers, including those already aboard a Continental flight bound for Houston, could be rescreened, said Laura Brown, a Transportation Department spokeswoman.

        Ms. Brown would not say what prohibited item a security screener heard the passenger mention.

        Columbus police and airport security guards did not find any prohibited items when they searched the concourse, she said.

        Four flights were delayed, but flights resumed after the concourse reopened, she said. The concourse, one of three at the airport, serves U.S. Airways, Air Ontario and Continental airlines.

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