A teacher of a private school in Sikkim's East District was arrested by police for allegedly sexually assaulting a six-year-old-girl, a police officer said on Wednesday.

The teacher was arrested on Tuesday night after the parents of the girl lodged a complaint at Pakyong police station against him, the officer said. A case under various sections of the IPC and also under the Protection of Children from Sexual Offences Act (POCSO) was registered against the accused teacher, he said.