Turkey has captured the elder sister of the slain Islamic State in Iraq and Lebanon leader (ISIL or ISIS) Abu Bakr al-Baghdadi in an attack in northwestern Syria, according to a senior Turkish official.
An official said Monday the 65-year-old known as Rasmiah Awad was detained with her husband, daughter-in-law and five children in a trailer container she lived near the city of Azaz in Aleppo province.
More:  Adults were questioned, he said, speaking to news agencies on condition of anonymity, calling detention intelligence a "gold mine."
"This species is a prospecting gold mine. What It Knows (ISIL) can significantly broaden our understanding of the group and help us capture more bad guys," said an official.
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The arrest comes days after US President Donald Trump announced in late October that US forces had carried out Operation Ling al-Baghdadi in the Syrian province of Idlib.
Turkish President Recep Tayyip Erdogan said that the capture of the woman is evidence o Turkey's determination to fight ISIL.
"The arrest of al-Baghdadi's sister is another example of the success of our anti-terrorist operations," Fahretin Altun wrote on Twitter early Tuesday.
"Very dark propaganda against Turkey is spreading to cast doubt on our determination against Daesh, "he writes, using the Arabic acronym for ISIL. " Our strong cooperation in the fight against terror with like-minded people can never be called into question.
Azaz is part of a region administered by Turkey after conducting a military operation to expel ISIL and Kurdish fighters, considered as "terrorists" in 2016. Syrian Allied groups rule the area known as the Euphrates Shield Zone.
Under the command of Al Baghdadi, ISIL has become one of the most brutal armed groups in modern history and at its peak its self-declared caliphate covers territory in Iraq and Syria, roughly equivalent to the size of the Kingdom . In the coming years, a series of offensives gradually stripped the group of its territory, with its fighters losing their final scrap of land in Syria in March this year.
Five days after Trump's announcement, ISIL confirmed the death of al-Baghdadi and named his successor as Abu Ibrahim al-Hashemi al-Quraish. He did not provide other details about the new leader.
A senior US official said last week that Washington is looking at a new leader to determine where it comes from.
World leaders welcomed his death, but they and security experts warned that the group remains a security threat in Syria and beyond.
Al Jazeera and News Agencies