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.

The US president rejects extending truce as Tehran warns of response and negotiators head to Islamabad

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.

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.

President Trump said he's extending the ceasefire until Iran has submitted a proposal in talks with the U.S. "and discussions are concluded."

Trump made the announcement as last-minute ceasefire talks between the U.S. and Iran looked increasingly uncertain with a two-week truce set to expire.

Trump appears keen to reach a deal to end the war, which is unpopular with Americans, as he deploys both pressure and diplomacy, analysts say.

The violence jeopardised the fragile truce between Iran and the US while the two sides considered a deal to end the fighting