NEW DELHI, May 6 -- The stage is set for a nationwide mock drill on Wednesday with all states and Union territories preparing to operationalise air-raid sirens and train people on evacuation protocols and cleaning of bunkers and trenches among other steps in the event of a "hostile attack".

The emergency preparedness, the first perhaps since 1971, will be conducted by most states from 4 pm.

Sources said the number of volunteers associated with this drill would be around 6 lakh but the final number could be more.

The drill follows the Union Home ministry's communication on Monday to states and Union territories to conduct the drills due to the "new and complex threats" that have emerged amid rising tensions with Pakistan following the Apr...