US official: IS leader believed dead in US military assault

The leader of the Islamic State militant network is believed dead after being targeted by a US military raid in Syria.

A US official told The Associated Press late Saturday that Abu Bakr al-Baghdadi was targeted in Syria's Idlib province. The official said confirmation that the IS chief was killed in an explosion is pending.

President Donald Trump teased a major announcement, tweeting Saturday night that "Something very big has just happened!"