Turkish official says Asma Fawzi Muhammad Al-Qubaysi revealed 'a lot of information' about the IS chief, jihadist group's inner workings

FSB security service cautions returnees 'quite often adhere to extremist religious ideology'

Associates paint a picture of a man obsessed with his security, a 'nervous wreck' who complained of treason among terror group's governors

Turkish official calls arrest of Abu Bakr al-Baghdadi's sister an 'intelligence gold mine'

Ankara says it will not accept the position that hundreds of IS prisoners should be tried in Turkey

Announcements offer first signs of support from terror group's global affiliates in Abu Bakr al-Baghdadi's successor Abu Ibrahim al-Hashemi Al-Qurayshi

Terror group says its new leader is Abu Ibrahim al-Hashimi al-Quraishi and issues stark threat to US

Gen. Frank McKenzi gives new details, 4 women, 2 men wearing suicide vests were killed when they refused to surrender; warns US on alert for possible 'retribution attacks'

Source said to be Sunni Arab, cultivated by Kurdish intelligence, who turned against Islamic State after terror group killed a relative

US president may have been referring to the Sunday killing by Kurdish and US forces of jihadist leader's spokesman and right-hand man, Abu Hassan al-Muhajir