U.S. President Donald Trump convened a meeting on Iran with his top national security team on Monday evening that included a briefing on military options, two U.S. officials told U.S. news outlet Axios on Tuesday.

A car bomb in Damascus killed a soldier on Tuesday, a Syrian civil defense source told AFP, with a security source saying an explosive was likely planted in a vehicle near a building affiliated with the defense ministry.

The civil defense source said at least one person was killed, while the security source told AFP an initial investigation had found the blast was likely caused "by an explosive device planted in a car".

Qatar said Tuesday that US-Iran negotiations, mediated by Pakistan, require more time to reach a deal, a day after President Donald Trump said he had postponed attacks to give the process a chance.

"We are supportive of the diplomatic effort by Pakistan that has shown seriousness in bringing parties together and finding a solution, and we do believe it needs more time," Qatari foreign ministry spokesman Majed al-Ansari said at a press conference.

Iran's army warned on Tuesday it would "open new fronts" against the United States if it resumes attacks, after President Donald Trump said he had held off launching a new offensive in hopes of striking a deal.

"If the enemy is foolish enough to fall into the Zionist trap again and launches new aggression against our beloved Iran, we will open new fronts against it, with new equipment and new methods," said army spokesman Mohammad Akraminia, according to Iran's ISNA news agency.

The United Arab Emirates for decades has advertised itself as a haven for international business in a Middle East awash in violent upheaval. Those waves have now crashed into this nation, testing its economic model like never before.

The UAE, a close ally of the United States and Israel, faced more missile and drone attacks from Iran during the war than any other country. The attacks — and Iran's chokehold on the Strait of Hormuz — have more than halved the Emirates' exports of crude oil and natural gas. Its tourism and conference sectors have also suffered.

President Donald Trump has considered himself an effective dealmaker above all else, but he appears to have hit a wall with Iran as his tough talk, threats and even military action have not moved Tehran from its long-established positions.

With shifting goals that make it difficult to judge the status of the U.S. effort, Trump and his top aides have insisted the United States has already won the war and that Iran is ready to reach an agreement in the wake of escalating U.S. threats during a tenuous ceasefire.

U.S. President Donald Trump said he would "hold off" an attack on Iran scheduled for Tuesday at the request of Gulf leaders.

Trump said on his Truth Social network on Monday that "serious negotiations" were now underway with Iran and that Gulf states believed "a deal will be made."

U.S. President Trump on Monday said that he is “not open” to any concessions for Tehran after receiving the latest Iranian response on peace deal talks.

Iran has given an updated proposal for a deal to end the war, but the White House believes it is not a meaningful improvement and is insufficient for a deal, a senior U.S. official and a source briefed on the issue told U.S. news portal Axios.

Iran's top security body announced on Monday the formation of a new body to manage the Strait of Hormuz, which Tehran has effectively closed and wants to charge ships to traverse.