New Delhi, May 10 -- Schools remained closed, and so did most businesses, as people in the border districts woke up to a tense Saturday morning, hung heavy with the wail of air raid sirens and the foreboding of what the day would bring.

People in several border districts of Punjab, Rajasthan, and Jammu and Kashmir spent an anxious night as authorities enforced a complete blackout for the second consecutive day amid heightened tensions with Pakistan.

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People residing near the border areas narrated their terrifying experiences to news agency ANI. A local from Rajasthan's Barmer said: "About 5:15 in the morning, we heard some sound, an...