Delhi Metro Rail Corporation has informed that 18 stations have been closed from 7:30 AM this morning till further instructions due to security reasons in the National Capital. These include Rajiv Chowk, Patel Chowk, New Delhi, Central Secretariat, ITO, Mandi House, Supreme Court and others. However, DMRC noted that the interchange facility shall remain available at Rajiv Chowk, Mandi House and Central Secretariat.