Why did India attack Pakistan? Are the two nuclear armed countries at war? US warns Americans to leave areas of conflict. Here's what we know so far.

India and Pakistan are fueling each other’s extremism without an off-ramp in sight. The conflict between India and Pakistan has just escalated faster than at any previous point since they both acquired nuclear weapons at the end of the 20th century. That may be because the two countries’ regimes have never been more alike.

Pakistan says it will avenge those killed by India’s missile strikes that New Delhi called retaliation for last month’s massacre of Indian tourists.