Nigeria, Nov. 10 -- US President Donald Trump has declared war on Iran "effectively over" and played down concerns about escalating the war.

He said Tuesday at a White House Conference that there was "positive momentum" toward ending the war in Iran.

His comment came after a meeting with Qatar's Prime Minister and top mediator, Mohammed Al Thani, in the Oval Office.

Mr Trump described the meeting as an "excellent conversation" about negotiations to end the war.

"We're just keeping it the status quo. And we're doing that really at the behest of countries that are their neighbours," he said.

Mr Trump said that although renewed attacks on Iran were "highly unlikely, the US is "locked and loaded" should the circumstances change.

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