Thirteen people died in Turkey's volatile southeast when gunmen, apparently Kurdish rebels, sprayed a min-bus with machine gun fire, prompting Prime Minister Recep Tayyip Erdogan Sunday to vow to punish the attackers. Saturday's audacious attack came a day after Turkey and Iraq signed an agreement to crack down on Kurdish rebels based in northern Iraq and the killing of a Kurdish separatist in the Kurdish-dominated east. "Terrorists from the Kurdistan Workers Party [PKK] used machine gun fire on a mini-bus carrying 14 people, killing 13," local governor Selahattin Apari said Sunday on the NTV television channel.The incident occurred near the town of Beytussebab in Sirnak province not far from the Iraqi border, he said, adding that the dead included a seven-year-old boy. The victims also included a local village chieftain and his four sons who were all members of the Village Guards.