New Delhi, April 13 -- Ceasefire talks between the U.S. and Iran ended in the early hours of Sunday without an agreement, raising questions about what happens when a current two-week truce expires on April 22.

As the talks wrapped up in the Pakistani capital, Islamabad, both sides blamed each other for the failure.

There was no word on whether negotiations will resume, and President Donald Trump made new threats against Iran.

The setback does not necessarily mean the war will resume. But it showed how entrenched the sides remain after an inconclusive 40-day war that inflicted heavy damage on Iran, reverberated across the region and shook the global economy.

Negotiators will now return to their capitals and reconsider their next moves....