Indian and Pakistani soldiers have exchanged heavy volleys of shells and gunfire across their frontier in Kashmir, killing at least five civilians in a growing military standoff.

New Delhi controls around 172 nuclear weapons, according to the Arms Control Association. Pakistan has approximately 170 nuclear warheads. India and Pakistan, two nuclear-armed nations, saw a decades-old conflict reignite May 7 as a terror attack in the disputed region of Kashmir led India to carry out cross-border airstrikes.