Turkish officials say at least 28 people have been killed and 61 others wounded in a car bomb explosion in the capital, Ankara.
The blast occurred as a convoy of military buses passed by, a few hundred meters from military headquarters. Ankara governor Mehmet Kiliclar said the blast appeared to have been caused by a car bomb.
An official said Turkish prime minister Ahmet Davutoglu has cancelled his planned trip to Brussels following the attack.
No one has claimed responsibility, but Turkish armed forces are carrying out major military operations against the Kurdish rebel group, the PKK, across the predominantly Kurdish southeast.
Omer Celik, the spokesman for the ruling AK Party, tweeted “terror has attacked treacherously in Ankara. We curse this attack.”
Last year Ankara was the target of the country’s worst terror attack in which more than 100 people died , when a pro-Kurdish rally was hit by two suicide bombers. That attack was blamed on the Islamic State militant group.