DIYARBAKIR, Turkey (Reuters) - Turkish warplanes bombed Kurdish militant camps in northern Iraq overnight, hours after a suicide car bomb attack targeting military buses killed 28 soldiers and civilians in the Turkish capital Ankara, security sources said on Thursday.

A car laden with explosives detonated next to the military buses as they waited at traffic lights near Turkey's armed forces' headquarters, parliament and government buildings in the administrative heart of Ankara late on Wednesday.