ankara bomb blast wreck bus carry police officer tuesday southern turkish province mersin injure 18 people attack security source blame kurdish militants seventeen hurt police officer deputy prime minister government spokesman bekir bozdag tell parliament brand terrorist attack turkey battle terror continue circumstances strong determine way bozdag say security source say militants outlaw kurdistan workers party pkk believe carry attack also say none wound critical condition one immediately claim responsibility bomb local mayor burhanettin kocamaz tell broadcaster haberturk attack take place street local governor office locate hit police vehicle pass image ntv show smoke billow area mersin yenisehir district ambulances police fire truck send site attack security source say turkey battle three-decade insurgency mainly kurdish southeast pkk frequently carry bomb attack security force southeast elsewhere pkk consider terrorist organization unite state european union well turkey 40,000 people kurds die since first take arm state 1984. eighteen injure bomb attack police vehicle turkey 's mersin province