Turkish authorities say a suicide bomber was behind Tuesday's blast that killed six other people in Ankara.

Ankara Governor Kemal Onal said Wednesday the bomber had a police record and used explosives similar to those used by Kurdish militants. There has been no claim of responsibility for the blast.

Turkish Prime Minister Recep Tayyip Erdogan described the bombing as a ruthless terrorist attack.

The Pakistani embassy says eight Pakistanis were among the more than 90 people wounded in the blast in a commercial district, Ulus. The Pakistanis were in Ankara for an international defense industry fair.

The rebel Kurdistan Workers Party (PKK) has been fighting for autonomy in Turkey's mainly Kurdish southeast since 1984.

Some information for this report was provided by AFP and AP.