ISLAMABAD (Reuters) - The widow of Islamic State leader Abu Bakr al-Baghdadi has revealed "a lot of information" about the group's work after her arrest last year, a Turkish official said.

The official said the widow said her name was Rania Mahmoud, but her real name was Fawzi Mohammed al-Qubaisi.

The detainee is said to be the first wife of Baghdadi, who was killed in an operation by US special forces in Syria last month.

The woman was arrested on June 2, 2018 in Hatay province, near the Syrian border, along with 10 other people, including his daughter, who was identified as Laila Jubeir.

The official said the woman's relationship with al-Baghdadi was confirmed using DNA samples from al-Baghdadi provided by the Iraqi authorities.

"We discovered the identity of his real wife very quickly, and donated a lot of information about Baghdadi and how ISIS operates."

Turkish President Recep Tayyip Erdogan revealed for the first time on Wednesday the arrest of Baghdadi's widow.

"We captured his wife," Erdogan told a group of students in Ankara. "It was announced for the first time. We did not make a big fuss about it."

He confirmed that Turkey also arrested Baghdadi's brother and brother-in-law, which was announced by the Turkish state media on Tuesday.

Erdogan criticized the United States for making a big fuss over Baghdadi's killing. "They launched a very large public relations operation," he said.

The leader of the Islamic State was killed in an operation by US special forces with the help of fighters from Kurdish factions in Idlib province (northwestern Syria), near the border with Turkey.

His killing came shortly after Turkey's military operation against Kurdish factions, which had been a key ally of the West as part of the war against IS.