Turkey says it has arrested 12 people in connection with Wednesday's bomb attack in the northwestern city of Bursa, in which 13 people were wounded.
The state-run Anadolu Agency said police detained 12 people in Bursa and Istanbul as well as two other cities.
A female bomber blew herself up Wednesday near a mosque in Bursa's historic district, a popular tourist destination. There has been no claim of responsibility.
Turkey has been hit by a series of suicide bombings this year, including two in Istanbul, which were claimed by Islamic State, and two in the capital, Ankara, claimed by a Kurdish militant group.
Leftist groups have also carried out attacks, mostly on police and security forces.
Bursa is Turkey's fourth largest city, an industrial center south of Istanbul across the Marmara Sea and a city distinguished by its abundance of Ottoman-era architecture.
