Avalon fog machine affects 20 teens HOLLYWOOD, July 22 (UPI) -- Police said 22 people under the age of 20 were treated for respiratory problems caused by a fog machine at a pre-party for the Teen Choice Awards in Hollywood. Six people were taken to a hospital for treatment, but most of those affected felt better after getting fresh air outside Hollywood's historic Avalon theater Saturday, KTLA-TV, Los Angeles reported Sunday. Those affected by the smoke were between the ages of 8 and 20. Brian Humphrey of the Los Angeles Fire Department said a few people at the party had superficial burns from contacting "dripping (condensed) liquid from apparent heavy use of smoke effect." Authorities said they are investigating a carbon dioxide-powered fog machine as the source of the problem, the Los Angeles Times reported. The party and concert by boy band Midnight Red were cancelled following the incident, NBC Los Angeles reported.