A suicide attack wounded at least seven people in the northwestern Turkish city of Bursa, a popular tourist destination.
Authorities said that a woman blew herself up near the main mosque of the city, killing herself.
There was no immediate claim of responsibility for the attack.
Turkey has been hit by a series of suicide bombings this year, including two in Istanbul, the country’s largest city, 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.
