Police arrested a 16-year-old boy after a flare was set off in the home end at Tony Macaroni Arena during the Livingston v Hearts match last Friday night.
Officers are investigating a further two incidents, one in the home end and one in the away stand.
“Fortunately, on this occasion, no one was injured however be assured that all incidents of this nature will be treated with the utmost seriousness.
“The consequences for those who do choose to bring pyrotechnics into football matches include being arrested and charged, as well as receiving a football banning order.”
A report will be submitted to the procurator fiscal.