The offices of Turkey's ruling Justice and Development Party were bombed Wednesday in Istanbul, wounding two people.
Separately, in southeastern Turkey, reports say Kurdish rebels have killed at least three soldiers during a government military operation. At least four other soldiers were reported wounded in the ambush in Sirnak province near Iraq.
Earlier, a Turkish policeman died after Kurdish rebels attacked a police station in Bingol province.
The attacks follow a week of daily clashes between Kurdish protesters and security forces in mainly Kurdish parts of the country.
At least 16 people have been killed in the unrest, which began after a funeral for 14 rebels of the Kurdistan Workers Party killed by the security forces.
Turkey's prime minister, Recep Tayyip Erdogan, Tuesday appealed for calm and national unity.
Some information for this report provided by AP and Reuters.