Perth OPP responded to a report on Binning Street West in Listowel just after 8pm last night.
Investigation found that the 3 suspects demanded a victim empty their pockets while one of the suspects held a knife.
The teens were found a short distance away and arrested. A 17 year old and 2 15 year old North Perth residents were charged with robbery with a weapon and mischief with a value of less than 5000 dollars.
All 3 were released and set to appear in Court in Stratford at a later date.