"Being a low-cost option and easily available, utilisation of these aerial/sub-surface platforms for sinister purposes by terrorist groups such as intelligence collection, weapon/explosives delivery and targeted attacks have become an imminent danger and challenge for security agencies worldwide,? he said at the 2nd High-Level Conference of the Head of Counter-Terrorism Agencies of the Member States in the General Assembly. "The possibility of the use of weaponised drones for terrorist purposes against strategic and commercial assets calls for serious attention by the member states. We have witnessed terrorists using UAS to smuggle weapons across borders," Kaumudi said, according to his statement issued by the Permanent Mission of India to the UN.