Two girls of a local government school were allegedly sexually harassed by their 45-year-old headmaster who has been arrested, police said on Saturday.
Police said Murugesan had allegedly sexually harassed the girls, aged 15, on Thursday.
The girls had complained about the harassment to their parents who lodged a complaint with police.
People at Thiruvalluvar Nagar, where the school is located, blocked traffic demanding his arrest.
They alleged that the headmaster had misbehaved with the girls earlier also.
Murugesan was arrested on Saturday, police said.