Trump's announcement came after an expected trip by Vice President JD Vance to Pakistan for a peace talks with Iranian officials was put on hold.

By Steve Holland, Enas Alashray and Mubasher Bukhari WASHINGTON/CAIRO/ISLAMABAD, April 21 (Reuters) - Iran said on Tuesday it had still yet to decide whether to attend last-ditch peace talks with the United States,

The extension was announced just hours before it was set to expire. The president did not provide details on how long the new ceasefire extension will last.

The United States and Iran have signalled they will hold a new round of ceasefire talks in Pakistan, two regional officials said Tuesday, as leaders on both sides warned they were prepared for more fighting if a fragile two-week truce expires without a deal.

With a two-week ceasefire set to expire and Iran balking at the resumption of peace talks, President Trump said he would be extending the deadline to allow for Iran to "come up with a unified proposal.

Oil pushed higher as US president Donald Trump cast doubt over the ceasefire with Iran after rejecting Tehran’s latest peace offer, prolonging the effective closure of the vital Strait of Hormuz. Brent crude traded near $105 a barrel after rising 2.

Iran has warned the US to accept Tehran’s latest peace proposal as tensions over the fragile ceasefire continue to escalate

Trump and Iran remain locked in a tense stalemate with dueling blockades as the ceasefire falters and nuclear deal negotiations hit a dead end.