( CNN ) -- At least four people , including three soldiers , were killed on Tuesday in a blast that struck a military truck as it traveled along a road in Turkey 's southeastern Tunceli province , according to local officials and state media . Turkish state TV channel TRT reported the deaths and several injuries on its website , and blamed the attack on terrorists . One of those killed was a passerby . It was unclear if the attack caused more casualties . Many ambulances were sent to the scene in central Tunceli , the semiofficial Anatolia news agency reported . An official with the Tunceli governor 's office , who was not identified because he was not authorized to speak to the media , told CNN that the office was not yet able to confirm the number of dead or injured . There was no immediate claim of responsibility . However , suspicion within Turkey is likely to fall on Kurdish militants . Tunceli province is a predominantly Kurdish region where frequent clashes have occurred between the Turkish military and fighters from the militant Kurdistan Workers Party , or PKK . The International Crisis Group said in a report last week that Turkey 's long-simmering war with the Kurdish insurgency had escalated , raising casualties to a level not seen in more than a decade . More than 700 people have been killed in the past 14 months , according to the conflict resolution organization that has extensively researched Turkey 's war with the PKK . Turkey , the United States , and the European Union have formally labeled the PKK a terrorist organization . The Kurds , Turkey 's largest ethnic minority , make up roughly 20 percent of the population . CNN 's Yesim Comert contributed to this report .
At least three soldiers and a passerby were killed when blast hits military truck , state media reported . The vehicle was traveling along a road in southeastern Tunceli province . Tunceli governor 's office said it could not yet confirm the number of casualties . Comment: