In the days since, tensions have risen dangerously between India and Pakistan, which have fought two of their three wars over Kashmir.

Relations between India and Pakistan are cratering following a deadly militant attack in Indian-administered Kashmir that has sparked tit-for-tat reprisals and raised fears of another military escalation between the nuclear-armed rivals.

With tensions simmering, the militant attack has governments worried that India and Pakistan are once again on the brink of conflict. Here’s what you need to know as relations between them plunge to their lowest level in years.