A few gates of nine metro stations could be closed due to security reasons, however, the stations are operational, Delhi Metro Rail Corporation said on Tuesday. This comes amid the farmers' 'Delhi Chalo' protest march. The nine metro stations affected are Central Secretariat, Rajiv Chowk, Udyog Bhawan, Patel Chowk, Mandi House, Barakhamba Road, Janpath, Khan Market and Lok Kalyan Marg.