New Delhi, May 6 -- The Union Home Ministry has asked all states to conduct mock drills on Wednesday in view of "new and complex threats" that have emerged amid rising tensions with Pakistan following the Pahalgam terror attack.

The measures to be taken during the mock drills include the operationalisation of air-raid warning sirens, training civilians on civil-defence aspects to protect themselves in the event of a "hostile attack" and cleaning bunkers and trenches.

The other measures are provisions for crash-blackout measures, early camouflaging of vital plants and installations and updating and rehearsing evacuation plans, a letter to the chief secretaries of all states and administrators of Union territories said.

The mock drills a...