Air raid sirens were heard in the national capital on Friday as part of a mock drill amid escalating tensions between India and Pakistan, and two waves of missile and drone attacks from across the border. In a statement before the drill, the Delhi government said the Directorate of Civil Defence would be testing air raid sirens installed at the Public Works Department (PWD) headquarters at ITO and asked people not to panic. "The testing will commence at 3.00 PM and be carried out for a period of 15-20 minutes. Accordingly, it is requested that adequate publicity may be made through social and electronic media so that general public are advised to stay calm and not to panic during the said exercise," the statement said.