A bomb set off by suspected Kurdish guerrillas killed three people and injured 14 others on Thursday in Turkey's Kurdish dominated southeast, the Anatolia news agency reported, as militants intensify their fight for autonomy in the region. Authorities were investigating whether a suicide bomber carried out the attack in the southeastern city of Van, bordering Iran, the state-owned agency reported. The blast near a supermarket heavily damaged a municipal vehicle and shattered the windows of several other vehicles and nearby houses and businesses, Anatolia said. Ambulances ferried the injured to local hospitals as police and paramilitary police forces were deployed at the site. Kurdish guerrillas have escalated their attacks recently. On Monday, suspected rebels killed four police officers in an ambush near the southeastern city of Batman and detonated a bomb under the car of a military officer in the town of Idil in Sirnak province. The bomb attack injured one. Guerrillas of the Kurdistan Workers Party, or PKK, have recently escalated their attacks in the region, while Kurdish militants believed linked to the outlawed group have staged several bombings across Turkey during the past month. The fighting has killed more than 37,000 people since 1984.