Senior politician and People's Conference chairman Sajjad Lone and PDP leader Waheed Parra, close aide of detained former chief minister Mehbooba Mufti, were released from preventive detention here on Wednesday, officials said. After the release of Sajjad Lone and Waheed Parra, 13 political leaders now remain detained at the MLA hostel in Srinagar which has been temporarily converted into a subsidiary jail.