United Airlines, Houston and Washington
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The FBI did not find any hazards after investigating a bomb threat that prompted a United Airlines plane to be evacuated at DCA.
The Federal Aviation Administration said Tuesday it issued a ground stop for traffic at Reagan Washington National Airport over a security issue. FlightRadar24, an flight tracking site, said the issue was due to an unconfirmed threat against a United Airlines airplane that had been moved away from other aircraft at the airport.