"Students who lead the battle want society to accept them, so they do something to draw people's attention," said one teacher who worked for more than 20 years at a school that has been at the centre of the violence.
"Fighting is the best way to get attention rather than winning scholarships -- that interests only a few people," said another teacher.
The problem has been compounded by the failure of schools to try to solve the problem, according to police.
Police Major General Adul Saengsingkaew claimed teachers deny their schools are involved and that troublemakers had already been expelled or left.
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