Pakistan has vowed to “settle the score” against India after a missile attack it labeled an “act of war.” Here’s what to know.

India fired missiles into Pakistani-controlled territory in several locations early Wednesday, killing at least 19 people including a child, in what Pakistan’s leader called an act of war. India said it struck infrastructure used by militants linked to last month’s massacre of tourists in the Indian-controlled portion of Kashmir.

A woman crosses a Border Security Force (BSF) checkpoint at the Attari-Wagah crossing on the India-Pakistan border near Amritsar, following Tuesday’s attack on tourists near south Kashmir’s scenic Pahalgam,