(WBZ/CNN) - Firefighters are warning of a dangerous new challenge that's circulating on the popular social media app TikTok. 

“It involves using the plug part of a phone charger, partially inserting it into the wall outlet, and then sliding a penny down the wall onto the exposed prongs,"  Massachusetts Fire Marshal Peter J. Ostroskey wrote in an advisory.

The challenge can lead to sparks, electrical system damage or even fires. 

It's already causing problems at some schools in Massachusetts, including Plymouth North High School.

A teacher told firefighters that two students dropped a penny between an outlet and phone charger, which caused the outlet to spark. Thankfully, no one was injured. 

Plymouth Schools Superintendent Dr. Gary Maestas called the incident an “irresponsible act.”

“We are working with the Plymouth Police and Fire Departments to fully understand the scope of this issue and pursue charges to the fullest extent of the law,” Maestas said in a statement.

Parents are advised to warn their kids about the dangers of participating in challenges like these, and to talk to them about fire and electrical safety.

Copyright 2020 WBZ via CNN. All rights reserved.

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