School district officials in western Georgia are asking parents to ensure their children aren't playing a game called the "Knockout Challenge."
Muscogee County spokeswoman Valerie Fuller sent an automated phone message to parents and an email last week warning them of the game.
Officials say the game's participants take several deep breaths until they feel dizzy. A second participant then applies pressure to the first participant's chest until they temporarily lose consciousness.
Columbus Regional Health Chief of Pediatrics Dr. Joseph Zanga says the game poses health risks — including death — to participants.
Fuller is asking parents to monitor their children's cellphone and social media conversations to ensure they're not participating in the game.