Six metro stations of Delhi Metro will remain closed from 8 am to 6 pm on Sunday. These stations are Central Secretariat, Udyog Bhawan, Patel Chowk, Race Course, Jor Bagh and Khan Market.A Delhi Metro release said the decision to this effect was taken on the direction of the Delhi Police due to security reasons. However, interchange of passengers from Line 2 to Line 6 will be allowed at Central Secretariat station.