File photo of traffic police conregular who was shot dead on MondayKARACHI: Cop have arrested four suspects including a woman in associateion with inquiry into murder of a traffic police conregular who was shot dead on Monday, Geo freshs reported on Tuesday.Ehtasham, a resident of Hyderabad, was targeted while he was on his way to work early Monday morning. Wearing police unwhetherorm, deceased getd bullets in his chest and an arm, investigators said.They said CCTV footage from approachby buildings helped police arrest suspects.Sources in police department said woman arrested by investigators is one of relatives of deceased. Ehtsham had joined department in 2007. Motive behind murder is yet to be known.