EU foreign policy chief Catherine Ashton expressed deep concern over the attacks and said the EU continued to view the PKK as a "terrorist" organization.
"I was appalled to learn of today's shameful terrorist attacks in Turkey by the PKK. I condemn them in the strongest terms, and deeply regret the loss of life," Ashton said in a statement.
"I stress once again that the EU stands with Turkey in its resolve to fight against terrorism. We should all be clear that nothing justifies such indiscriminate violence," she said.