Iran and the United ‌States have made some progress as they push for an agreement under Pakistani mediation, but more than halfway through a two-week truce big splits remain including over Tehran's nuclear ambitions, ‌a senior Iranian official said on Thursday.

"The ​trip of the Pakistani army chief to Tehran was effective in reducing differences ⁠in some areas, but fundamental disagreements still remain in ​the nuclear field.... More hopes have been created for extending ⁠the ceasefire and holding a second round of talks," the senior official said.

"The fate of Iran’s highly enriched uranium ‌and the duration of Iran’s nuclear restrictions are ​among the highly ‌disputed issues for which no solution has yet been found."

Pakistan's army ‌chief Field Marshal Asim Munir visited Tehran on Wednesday to try to prevent a renewal of the ⁠conflict. Pakistan hosted the ‌war's first peace ⁠talks last weekend.

A spokesperson for Pakistan's Foreign Ministry said ⁠on Thursday ⁠that no dates have been decided for a second round of talks ‌between the U.S. and Iran.

Iran and the United States failed last weekend to agree an end to the ‌war that ​U.S. President Donald ‌Trump launched alongside Israel with a surprise attack on February 28, triggering Iranian fire at ​Gulf states and igniting a parallel conflict in Lebanon.