Mock drills to be held in all districts by 2023 to combat chemical, biological, radiological and nuclear disasters Updated: Updated: January 03, 2021 20:25 IST Home Ministry asks NDRF to to complete the first phase of this multi-agency exercise in three financial years, beginning 2020-21. Share Article AAA A team of NDRF personnel during a mega mock drill exercise, conducted by National Disaster Management Authority and Delhi Disaster Management Authority in New Delhi. File Picture | Photo Credit: Shiv Kumar Pushpakar Home Ministry asks NDRF to to complete the first phase of this multi-agency exercise in three financial years, beginning 2020-21. India is undertaking a mega exercise to conduct preparatory drills in each of its 740-odd districts by 2023 to combat various man-made and natural disasters with a special attention on tackling chemical, biological, radiological and nuclear (CBRN) attacks or accidents, the country’s disaster response force chief said.