India, April 12 -- High-stakes ceasefire negotiations between the United States and Iran were underway in Islamabad till late Saturday night with Pakistan mediating, marking the first face-to-face talks between the two adversaries since the Islamic Revolution of 1979.

A senior White House official confirmed that direct trilateral engagement involving US and Iranian delegations, with Pakistani facilitation, was underway in Islamabad.

The discussions, ongoing for over four hours, reportedly went into a scheduled break for internal consultations before resuming, underscoring the complexity and sensitivity of the issues under negotiation. The talks are being held under tight security arrangements and closely monitored by regional and intern...