Turkish police say one person was killed in a marketplace blast Saturday in the western port city of Izmir.
Officials say 14 others were wounded in the early morning blast.
Authorities say the homemade bomb was in a bag on a bicycle, and exploded as vendors were preparing their stalls for the day.
The blast comes one day before a planned massive demonstration in Izmir to support Turkey's secular system. Secularists say the government wants to undermine the country's strict separation of state and religion.
It is not clear who was responsible for the blast, which shattered windows in homes and cars. Kurdish militants, leftists and radical Islamic groups have carried out bombings in Turkey in the past.
Some information for this report was provided by AFP and AP.