A malfunctioning Denver International Airport concourse train sent out sparks and arcs of electricity after part of the car touched the rail Wednesday afternoon, slowing movement through DIA for nearly two hours.

Passengers posted photos of crowds packed into train waiting areas on social media and reported missing their flights, though airline officials contacted by The Denver Post did not provide an estimate of how many passengers were impacted.

The malfunction happened about 2:40 p.m. when part of a single train car came into contact with the rail, sending out “sporadic sparks” and arcs of electricity, airport spokesperson Courtney Law said in a statement.

Denver Fire Department crews responded to the airport, but smoke from the electrical discharge cleared before they arrived, Law said.

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