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TORONTO — A 15-year-old has learned the hard way to think very carefully about what to put in a carry on bag when boarding a plane.

Screening staff at Toronto’s Pearson Airport called in a police bomb disposal unit Saturday night when they detected what they thought was an explosive device.

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tap here to see other videos from our team. Try refreshing your browser, or Teen charged after bringing time-bomb alarm clock in carry-on bag to Toronto’s Pearson Airport Back to video

Would you pack this in you carry on luggage? Teenager thought it was a good idea yesterday at Pearson airport. http://t.co/zQDIsbYHpX —

Peel Regional Police (@PeelPoliceMedia) September 06, 2015

The police force responsible for security at Pearson, Peel Regional Police, say the device was fake.

They say it turned out to be a novelty alarm clock that looked like several sticks of dynamite bound together with a timer.

The teen has been charged with mischief.

Peel police tweeted a picture of the device on Sunday with the caption: “Would you pack this in you(r) carry on luggage?”