Washington: Amid reports of killing of Islamic State leader Abu Bakr al-Baghdadi, US President Donald Trump on Saturday said that "something very big" has happened.

"Something very big has just happened!" Trump tweeted.

This comes after media reported that the US military killed Baghdadi.

Russia Today has cited Newsweek as reporting that the terrorist was killed in a special operation raid in Syria's northwestern Idlib province, greenlighted by Trump about a week ago.

Meanwhile, Fox News has also quoted military sources saying that US-led forces in Idlib have killed a "high-value ISIS target" believed to be the Islamic State leader in Syria.

Meanwhile, the White House has announced that Trump is scheduled to make a major announcement on Sunday.

Trump administration has not revealed whether the matter is related to foreign or domestic policy.

In another report, an official said that the US Army's elite Delta Force carried out the mission with the CIA, which provided the intelligence.

The raid comes at a time when the US continues to withdraw hundreds of troops from northern Syria.