The Union Home Ministry has sought the permission of the Election Commission to extend the tenure of Delhi Police Commissioner Amulya Patnaik by a month in view of assembly polls in the national capital. Delhi's top cop is set to retire on Friday. The Home Ministry has sought permission to extend the tenure of Patnaik till February end. As Delhi is poll-bound, the poll panel's permission is needed for new appointment or extension in service of key government officials here. Delhi will go to polls on February 8 and the counting of votes is scheduled to be held on February 11.