A car bomb exploded in central Ankara , the Turkey capital, on Tuesday September 19th. See this article from the Wall Street Journal Online for details. Although the government of Turkey has indicated that there is, as of yet, no evidence of terrorism, the car bomb is thought by many to be the work of Kurdish militants. Areas supporting the militants near the southeast border of the country and in the Kurdish areas of Iraq have been the focus of bombing and military campaigns by the Turkish Armed Forces. There is concern that the current action by the Turkish military against the PKK (The Kurdish Workers Party) may result in the spread of PKK-related terrorism to other cities in Turkey as well as to tourist areas in the country.
If you are planning to visit Turkey exercise caution, avoid political rallies, or celebratory crowds, as these could become targets for the PKK. Also, be sure to monitor local news for any information that could be of use to use in evaluating the PKK threat wherever you will visit in Turkey.