Tamil Nadu police on Sunday arrested environmental activist Muhilan on a sexual harassment complaint filed by a woman.
Anti-Sterlite copper smelter plant and anti-Kudankulam Nuclear Power Plant (KNPP) activist Muhilan went missing in February this year after boarding a train from the Egmore railway station here.
He was detained by the police in Tirupati in Andhra Pradesh and was later handed over to the Tamil Nadu police.