A vape pen disassembled by its owner to prevent sparking a fire did just that when it passed through an x-ray in the TSA security line at Denver International Airport in January, according to an incident report released Friday.

The vape pen’s exposed lithium-ion battery led to a man’s satchel catching fire in the Transportation Security Administration checkpoint around 5 p.m. on Jan. 30, according to the report from the Denver Fire Department. A TSA agent immediately put out the flames with a fire extinguisher.

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The whole incident only took 55 seconds but it still meant waiting travelers had to evacuate and wait for other security lines to open, the report said.

The Federal Aviation Administration prohibits electronic cigarettes and vaping devices in checked bags. Passengers can bring them in carry-on baggage or on their person. But some airlines have policies against them.

The vape pen’s owner, a man whose name was redacted in the report, was not charged.