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       The Islamic State group leader who reportedly had a $25 million bounty on his head is believed to have been killed in Syria.

       A "high value ISIS target" -- believed to be Islamic State mastermind Abu Bakr al-Baghdadi -- was killed by U.S.-led forces in Idlib, a well-placed military source told Fox News on Saturday night.

       A senior Trump administration official later confirmed the source's account.

       At 9:23 p.m. Saturday, President Trump posted a Twitter message hinting at "very big" news.

       ISIS LEADER CALLS FOR 'CALIPHATE SOLDIERS' TO FREE DETAINEES FROM CAMPS, CONTINUE ATTACKS

       Soon after, the White House issued a statement that major news would be announced there at 9 a.m. Sunday.

       ISIS leader Abu Bakr al-Baghdadi.

       WHERE IS BAGHDADI? INSIDE THE HUNT FOR THE ELUSIVE ISIS LEADER, THE WORLD'S MOST WANTED MAN

       Newsweek reported late Saturday that Baghdadi was killed during a special operations mission that President Trump approved about a week ago.

       In September, an audio recording purportedly by Baghdadi included a call for members of the extremist group to use any means necessary to free Muslims who were being detained "by Crusaders and their Shiite followers."

       The U.S. had reportedly posted a bounty of $25 million for information leading to the capture of Baghdadi.

       Earlier this year, Iraqi intelligence officials speaking to Fox News maintained he was lurking in Syrian border towns, often donning non-traditional or “regular” clothes, using a civilian car and making sure all those around him had no mobile phones or electronic devices in order to bypass detection.

       Some experts had predicted that as time passed and ISIS losses in the Middle East started to mount, it was inevitable that Baghdadi would either be captured or killed.

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       “Baghdadi is probably moving around a lot to avoid detection," Jeffrey Simon, a terrorism expert and founder of the national security consultancy firm Political Risk Assessment Inc., said earlier this year. "But it will just be a matter of time before he is found.

       "I believe that he is still alive," Simon added at the time. "News of his death would have been hard to keep secret for very long.”

       This is a developing story. Check back for updates. Fox News' Jennifer Griffin, John Roberts and Hollie McKay contributed to this story.