New developments in the nuclear powers’ harrowing four-day conflict, along with entrenched religious nationalism on each side, could signal more frequent battles ahead.

NEW DELHI — India and Pakistan agreed to an immediate ceasefire on Saturday, halting days of clashes that killed dozens of people and pushed the nuclear-armed neighbors to the brink of war.

The first word of the truce came from President Trump, who announced that the two countries had reached a "full and immediate ceasefire," after talks mediated by the U.S.