QUETTA Two persons including a cardiologist were shot dead in two different incidents while two others were wounded in incidents of firing and hand grenade attack in different towns of Balochistan on Thursday. According to reports reaching here, unidentified assailants gunned down a cardiologist in Khuzdar town, some 350 kilometers away from the provincial capital. The sources said that cardiologist Doctor Fahim Sajjid was shot dead by unidentified armed men near Civil Colony of Khuzdar town when he was on his way to the clinic. They opened fire with sophisticated weapons and escaped from the scene. The deceased belonged to Punjab and previously his house was also attacked with a hand grenade. On being informed, officials of the police and administration reached the site and started probe into the murder. 'Apparently it is an incident of target killing, said a police officer,adding, that investigations are underway to ascertain the motive behind the killing. In yet another similar incident, armed men riding a motorbike opened indiscriminate firing on a person identified as Abdul Haq in Hub town while he was sitting in his shop. Resultantly, he sustained serious injuries and was rushed to Civil Hospital where doctors pronounced him dead. The gunmen escaped from the scene after committing the crime. The sources said that deceased Abdul Haq was a resident of Punjab and was running a general store. Meanwhile, armed assailants attacked a welding shop owned by a settler with hand grenade in Nushki town. As per reports reaching here, assailants hurled a hand grenade into a welding shop located on Ainuddin Road of Nushki town which exploded and wounded two workers identified as Shahbaz and Shakir. They were rushed to Civil Hospital Nushki for first medical aid and later, referred to Quetta for further treatment. Police has registered cases of the incidents and started investigations.