One of the longest-serving officials and the 'spokesman' of the Daesh terrorist organization, Muhammad Al-Adnani has been killed in Syria's northern Aleppo, SITE intelligence reported late Tuesday, citing the group's Amaq media.Amaq reported that Adnani was killed "while surveying the operations to repel military campaigns against Aleppo".Adnani is a Syrian from Idlib who pledged allegiance to Daesh's predecessor al-Qaeda more than a decade ago and was once imprisoned by U.S. forces in Iraq, according to the Brookings Institution.The Syrian was known for his fiery calls for attacks on Arab and Western targets.

Earlier this year, he called for massive attacks during the Muslim holy month of Ramadan. He has also called for attacks in Western countries, telling Muslims in France on occasion to attack "the filthy French" in any way they could, including "crush them with your car."

He has also disparaged Saudi Arabia and its influential clerics for failing to rally behind the rebels that the monarchy supports in Syria like they did decades ago in Afghanistan.

There was no immediate comment or confirmation from Washington of his death.

Adnani had been one of the last remaining members alive of the group that founded Daesh along with the group's self-appointed caliph Abu Bakr al-Baghdadi.

As spokesman, he was its most visible member. As head of external operations, he was in charge of attacks overseas, an increasingly important tactic for the group as its core Iraqi and Syrian territory has been eroded by military losses.

Amaq did not say how Adnani, born Taha Subhi Falaha in Syria's Idlib Province in 1977, was killed. Daesh published a eulogy dated Aug. 29 but giving no further details.

FACE OF GROUP

Iraq said in January that Adnani had been wounded in an air strike in the western province of Anbar and then moved to the northern city of Mosul, Daesh's capital in Iraq.

Adnani is likely to be succeeded in his military role by the financial comptroller of the group, Iyad al-Obaidi, also known as Saleh Haifa, a security officer and Saddam.

The United States designated him a "global terrorist" this year and says he was one of the first foreign fighters to oppose U.S.-led coalition forces in Iraq since 2003 before becoming spokesman of the militant group.

There is a $5 million reward on his head under the U.S. "Rewards for Justice" program.