Iran has informed the U.S. via Pakistan that it will not be going to Islamabad for a new round of talks on Wednesday, Iranian media reported Tuesday as uncertainty clouded plans just hours before a two-week ceasefire was due to expire.

According to U.S. media reports, Tuesday's departure of the U.S. delegation led by Vice President JD Vance has been put on hold.

There has so far been no official confirmation from Tehran on whether it will take part in further peace talks in Islamabad.

Tehran’s decision to not attend the second round of negotiations due to various reasons is final and has been communicated to Washington through Pakistan, Iran’s semi-official Tasnim News Agency reported.

Iranian officials have accused the U.S. of repeatedly violating the cease-fire since it took effect two weeks ago. They said the U.S. naval blockade in the Strait of Hormuz is an act of war and also constitutes a violation of the cease-fire.