The reward for any information leading to the leader of ISIS is now at $25 million.
Abu Bakr al-Baghdadi is the self-proclaimed "caliph" of ISIS.
SEE MORE: These Women Are Fighting ISIS
In 2011, the State Department set the reward for information that led to his location or arrest at $10 million. Since then, he's seemed to stay one step ahead of U.S. intelligence.
That could be because al-Baghdadi is incredibly secretive. Top ISIS leaders communicate with him through handwritten letters or in-person meetings. Even then, he's known to wear face coverings.
The push to find al-Baghdadi comes as U.S. and local forces close in on ISIS, retaking much of Mosul — ISIS' last stronghold in Iraq — and Palmyra in Syria.
The U.S. also said in early December it would deploy more troops in the push to retake the Syrian city of Raqqa, the focal point of ISIS territory.
