A suspected bomb threat on a United Airlines plane forced a ground stop at Virginia’s Reagan Washington National Airport on Tuesday.

All flights were put on hold after the apparent threat was reported on a plane that had just touched down from Houston, law enforcement sources told The Post.

Passengers were quickly offloaded as emergency vehicles swarmed the runway just outside Washington, D.C.

The exact nature of the threat wasn’t immediately clear.

The Federal Aviation Administration only described the incident as a “security issue.”

“The FAA is aware of a reported security issue on an aircraft at Reagan Washington National Airport (DCA),” the agency said in a statement.

“Passengers have been removed and the aircraft is away from the terminal while authorities investigate.”

The gro

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