The arrests were made at Maradamunai, Saindamaruthu and Nampattimunai and push cycles and motorcycles belonging to the suspects too, were taken into custody.
Covering their faces with black clothing, they had stoned two buses at Maradamunai.
They are due to be produced before courts today.
Meanwhile, Bodu Bala Sena chief Galagodaatte Gnanasara Thera says the youths turned unruly after police failed to explain its measures against those responsible for the death of a person in an assault incident in Teldeniya.
He told the media that had they been told that the suspects had been arrested and remanded, the incidents would not have taken place.