Turkey has captured sister of dead ISIS leader Abu Bakr al-Baghdadi in a northern Syrian town, a senior Turkish official said.

The government is now interrogating her husband and daughter-in-law, who were also detained.

Rasmiya Awad, 65, was detained in a raid near Azaz, the official said, referring to a Turkish-controlled Syrian town near the border. She was in company of five children when captured.

“We hope to gather a trove of intelligence from Baghdadi’s sister on the inner workings of ISIS,” the official said.

Baghdadi blew himself in October after he was cornered in a tunnel during a raid by US Special Forces in northwestern Syria.

Islamic State, in an audio tape posted online on Thursday, confirmed that its leader had died and vowed revenge against the United States.

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World leaders welcomed his death, but they and security experts warned that the group, which carried out atrocities against religious minorities and horrified most Muslims, remained a security threat in Syria and beyond.

Baghdadi had risen from obscurity to lead the ultra-hardline group and declare himself “caliph” of all Muslims.

He held sway over huge areas of Iraq and Syria from 2014-2017 before Islamic State’s control was wrested away by U.S.-led coalition forces including Iraqis and Syrian Kurds.