ISLAMABAD: A security guard of a private housing society was gunned down by extortionists in Rawat area on Friday. According to details, extortionists Mustaq Kiyani and Mohammad Yunus stopped the ongoing construction work of a private housing society by force and demanded extortion money from the owner. Upon refusal and resistance, they opened fire on the employees of the society, leaving two persons including a security guard severely injured. The injured were rushed to a local hospital for medical treatment however, security guard Mohammad Mubashir succumbed to his injuries on way to the hospital. The other injured was identified as Afzal Qamar.