The blast struck a crowded market in the Sadr City district of the Iraqi capital on Wednesday.
Abdul Nadir Mumin defected from Al-Shabab to recruit fighters for ISIS in the failed state.
One of four suspects arrested received orders from ISIS-controlled territory, investigators say.
Intelligence officials said Italian, Spanish and French beaches are at risk of a Sousse-like attack.
The woman who was married to the world's most wanted man wants a new life in Europe.
Baghdad's forces have begun operations in Nineveh province to clear ISIS from nearby villages.
The documents show group makes members fill out entrance questionnaire to be inducted.
Swedish media outlets say she was 15 and pregnant when she ran away to Syria last year.
Jack Letts from Oxford has not joined ISIS, he is helping refugees, his family says.
Moshe Yaalon says ISIS is being weakened by the U.S.-led coalition while Iran proliferates extremism.
Sister of ISIS militant says she "does not want to give up" on her brother.
Abu Saleh was assassinated in a targeted airstrike in late November.
Strikes against the group in Iraq and Syria are squeezing their vital revenue stream, new report says.
A new report from the human rights group says years of unregulated weapons sales has given ISIS a huge arsenal.
More than two-thirds of Americans say Obama's policies against ISIS have not been aggressive enough.
Abu Alaa Afri is taking on a prominent leadership role in the group, an adviser and experts say.
Ansar al-Sharia's spiritual leader defects to ISIS in bid to influence fellow North African jihadis.
Tarek Alghorani spent seven years in jail for mocking Assad's regime. Now living in Tunisia, his new target is ISIS.