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.

The ceasefire had been expected to bring a swift end to weeks of escalating clashes triggered by the mass shooting of tourists last month that India blames on Pakistan.

By Gibran Naiyyar Peshimam, Shivam Patel, Charlotte Greenfield, Aftab AhmedISLAMABAD/NEW DELHI (Reuters) -Nuclear-armed neighbours India and Pakistan agreed to a ceasefire on Saturday after U.S. pressure and four days of fighting,