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.

But hours after the deal was confirmed, there have been accusations that the agreement is not being entirely upheld.