Turkey's Interior Minister Efkan Ala says one person was detained after the suicide bombing in Istanbul which killed 10 foreigners.
The minister says 11 injured people remain in hospital, including nine Germans, of whom two are in serious condition.
Ala is giving a joint press conference in the Turkish metropolis with his German counterpart Thomas de Maiziere, who called this an attack "against humanity." The two pledge to cooperate fully.
The minister says more than 3,300 people have been detained as part of Turkish operations against the Islamic State, including 220 people in the week prior to the attack.