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Monday’s strike was the latest by the U.S. military to kill a top official with the extremist group that once controlled large parts of Iraq and Syria, where it declared a “caliphate.� From the areas they once controlled, the extremists of people. In recent years, such attacks have decreased because the Islamic State group lost the last sliver of land it controlled in March 2019.

The extremist sleeper cells

Opposition activists in northwest Syria said the man killed showed up in the area about 10 days ago claiming to be a displaced person from the eastern province of Deir el-Zour, bordering Iraq. Al-Jabouri is one of Iraq's biggest tribes that also has presence in east and north Syria and the man might have said that he is from Deir el-Zour to hide his Iraqi identity as residents of east Syria speak Arabic dialect similar to the one spoken in Iraq.

The Britain-based Syrian Observatory for Human Rights, an opposition war monitor, said on Monday that one person was killed in a drone strike near the rebel-held village of Kefteen. The Observatory's chief Rami Abdurrahman identified the dead man as an Iraqi citizen who was struck with a missile as he spoke on his cellular phone outside the home he rented.

The opposition’s Syrian Civil Defense, also known as the White Helmets, said it evacuated the man from the scene of the attack and he later succumbed to his wounds.

The strike was the latest in a series of attacks over the past years targeting al-Qaida-linked militants and senior members of the Islamic State group in northwestern Syria.

Most of those killed by U.S. strikes in the rebel-held Idlib province over the past years were members of al-Qaida offshoot Horas al-Din, which is Arabic for “Guardians of Religion.� The group includes hardcore al-Qaida members who broke away from Hayat Tahrir al-Sham, the strongest insurgent group in Idlib province.

In February, , whom local activists initially identified as Horas al-Din members. The Observatory later said that one of the two killed was a senior member of the Islamic State group that was defeated in Syria in March 2019.

The founder of the Islamic State group, . His successor, in northwest Syria.

In October, Syrian rebels killed the group's leader, , and he has since been repalced by Abu al-Hussein al-Husseini al-Qurayshi.

None of the al-Qurayshis are believed to be related. Al-Qurayshi is not their real name but comes from Quraish, the name of the tribe to which Islam’s Prophet Muhammad belonged. IS claims its leaders hail from this tribe and “al-Qurayshi� serves as part of an IS leader’s nom de guerre.