At least 3 people including a Delhi Police Assistant Sub-Inspector were killed in Mianwali area in West Delhi on Sunday. The incident took place late last night when three persons including a Delhi police officer were killed when unidentified men opened fire on them. The deceased have been identified as Bhupendra, Arun and sub-inspector Vijay. Meanwhile constable Kuldip was severely injured. He is currently being treated at a hospital. Delhi police has started an investigation regarding the matter.