India and Pakistan agreed to an immediate ceasefire on Saturday, unexpectedly halting the worst fighting in decades between the nuclear-armed neighbors, just when their tit-for-tat strikes appeared to be spiraling out of control.

ISLAMABAD — Pakistan armed forces said they are targeting military sites in India after India fired missiles at three air bases in Pakistan’s Punjab province early Saturday, bringing the nuclear-armed rivals closer to war.

Blasts were heard in Srinagar and Jammu and projectiles and flashes were seen in the night sky over Jammu, similar to the events of the previous evening, according to authorities, residents and Reuters witnesses.