The Istanbul suicide bomber "recently entered Turkey from Syria," Turkish Deputy Prime Minister Numan Kurtulmus has said.
More from Turkish prime minister Davutoglu ("Daesh" is an Arabic acronym for the IS group).
More from Turkish prime minister Davutoglu, via Daily Sabah.
Turkey's Prime Minister Davutoglu has confirmed that the Istanbul suicide bomber was a foreign IS militant, tweets Reuters' Ece Toksabay.
There have been various reports from Turkey about the identity of the bomber, with some saying he was Syrian and others that he was Saudi-born.
"Give us anything, biscuits, bread, anything" -- a first-hand account from an eyewitness with the UN convoy that entered the Syrian town of Madaya yesterday.
Turkey's Dogan news agency is reporting that the Istanbul suicide bomber was a Saudi Arabian named Nabil Fadli, born 1988.
The confusion over the nationality of the Istanbul suicide bomber is ongoing.
From our news desk:
Bosnia Holds Four For Planning To Join IS Group
Authorities in Bosnia-Herzegovina say they have detained four people on suspicion of planning to join the Islamic State (IS) group.
Prosecutors said one of them, 22-year-old Senad Kostac, was detained in Turkey while trying to reach Syria and handed over to Bosnian authorities.
The other three, aged 26, 27 and 55, were arrested near the northwestern town of Velika Kladusa.
Several hand grenades, land mines, a machine gun, ammunition, and a flag of the IS group were seized during a police raid.
The operation followed similar raids in the Sarajevo area in December, when 11 people were arrested on suspicion of having links with the IS group. Eight of them were remanded in custody.
Bosnia hardened its legislation last year, allowing sentences of up to 20 years in jail for militants and their recruiters.
There is confusion over the identity of the suicide bomber reportedly responsible for the blast this morning in Istanbul.
Turkish President Erdogan said earlier that the bomber was thought to be a 28-year-old Syrian, but local agencies are reporting that the bomber was born in Saudi Arabia.