India and Pakistan engaged in the most intense fighting in decades with four days of escalating conflict that included fighter jets, missiles and drones packed with explosives. It ended almost as abruptly as it began.

India’s missile and bomb strikes on targets in Pakistan and Pakistani-controlled Kashmir have prompted multiple attacks in retaliation between the nuclear-armed neighbors to the point that some are now calling it a de facto war.

State-run Pakistan Television said Saturday that retaliatory attacks are underway after India fired missiles at three air bases inside Pakistan. It did not give details, and it was unclear which military locations in India were being targeted.