at least twenty eight people killed in the blast in central Ankara another sixty injured , no group claimed responsibility for the bomb which went off near a busy intersection during rush hour , but Turkish security sources say it was probably carried out by militants from the outlawed Kurdistan workers party or PKK , on Thursday morning local people seemed inclined to agree , unless there is some , the Kurdish involvement is concerned it's likely to further inflame , Turkish forces conducting days of artillery strikes on Kurdish forces inside Syria