New Delhi, March 24 -- An 18-year-old alleged "key operative" of Pakistan-based terror outfit Tehrik-e-Taliban Hindustan (TTH), linked to gangster-turned-terrorist Shehzad Bhatti, was arrested by the Delhi Police's special cell, officials said on Monday. Police said the accused, Harmandeep Singh alias Harman from Rampur in Uttar Pradesh, was in touch with Bhatti and other foreign-based handlers through social media and was being groomed to carry out grenade attacks and paint pro-TTH graffiti in Delhi, Punjab and Uttar Pradesh. He allegedly painted TTH graffiti at three locations in Punjab's Hoshiarpur district in February and shared photos and videos with his handlers. A mobile phone with incriminating chats and a spray paint can were recov...