Pottalputhur Government High School premises wearing masks and stabbed two girls, were arrested, police said today.
The girls suffered minor injuries and had been admitted to Ambai Government Hospital for treatment.
Police said yesterday they arrested two of the five youths who threatened the girl students with knives and teased them for the past one week, following complaint and demonstration by the local people.
The youths had also forced a girl to pose with them for a mobile photo and had been blackmailing the girl for the last several youths.