Thirteen Turkish troops were dead and seven injured in a clash on Thursday in the city of Diyarbakır, according to the Anatolia news service. Troubled by the reports, Prime Minister Tayyip Erdogan called an emergency conference in his Ankara office. The clash in Diyarbakır was reportedly sparked by the PKK, whose jailed leader is discussing an extended ceasefire with the government. According to media reports, Turkish air force has launched aerial operations in the conflict zone in southeastern Turkey. Meanwhile, Iran has deployed 5,000 troops along the Kurdish borderland areas with Iraq where the tensions have increased in recent days.