The PKK has been fighting a 30-year war for Kurdish autonomy in southeast Turkey. At least 45,000 people have been killed in the conflict.
In recent months, the Turkish Government has arrested thousands of Kurds across the country, including some elected officials, often on questionable evidence. After a lull, the PKK resumed attacks, claiming the Turkish Government has backed away from an agreement offered by the group's leader, Abdullah Ocalan, who has been imprisoned by Turkey since 1999.
Others, however, felt the attacks were related to ongoing unrest across the region. "Whoever supports terror secretly or openly, they all should know that Turkey will be following them and they'll pay for that," said Erdogan.
"The latest attack clearly proves that PKK became a sub-contractor of some," he said, implying the PKK was controlled by an unnamed regional organisation.
In the past weeks, Turkey has broken with its traditional allies Iran and Syria. Following popular uprisings in Syria and a repressive crackdown by the Assad regime, Turkey sided with its Nato allies and even allowed the Syrian opposition to organise on its soil.
- INDEPENDENT