Chennai: An environmental activist, who reportedly went missing after boarding a Madurai-bound train from here a few months ago, was traced to Tirupati and arrested for allegedly sexually abusing a woman, police said Sunday.

Tamil Nadu Fisheries Minister D Jayakumar told reporters that the activist, RS Mukilan, had been brought to Chennai from Tirupati. "Right now, the CB-CID is investigating the (missing) case on the court's direction," he said. Asked whether he was kidnapped, the minister said it would be known only after the probe was over.