Oman on Monday denied reports that it had conveyed a message from the United States to the Iranian government over the downing last week of an American unmanned drone.

"The Sultanate is watching current regional developments with concern and hopes that the Iranian and American sides show restraint and address unresolved issues through dialogue," the foreign ministry also said in a post on Twitter.

Two Iranian sources told reporters on Friday that U.S. President Donald Trump had warned Tehran via Oman of an imminent U.S. attack, which he later called off after Iran downed the drone. Trump has denied sending such a message.

Trump said on Saturday that the government was taking a diplomatic path to put pressure on Tehran by moving to impose new sanctions. Military action was "always on the table," the president said, but he added that he was open to quickly reach a deal with Iran that he said would bolster the country's flagging economy.

(With inputs from Reuters.)

(Cover: An undated U.S. Air Force handout photo of a RQ-4 Global Hawk unmanned (drone) aircraft. U.S. Air Force. /VCG Photo)