Shah Faesal, the Kashmiri IAS topper who quit the civil services for politics, was detained at the Delhi airport on Wednesday.
It is said that he was about to fly abroad. Soon after the detain, he was sent back to Srinagar, where he was placed under house arrest under the Public Safety Act.
Shah Faesal has been critical about the government's move to end special status to Jammu and Kashmir and split it into two union territories. Reports suggest he was on his way to Istanbul.