Police hunt man involved in attempted robbery at Dumbarton shopClarke, of Glasgow, was driving the refuse truck which struck and caused the deaths of six people in the city’s Queen Street on December 22, 2014.Student Erin McQuade, 18, and her grandparents 68-year-old Jack and 69-year-old Lorraine Sweeney from Dumbarton lost their lives in the incident.Stephanie Tait, Jacqueline Morton,51, and 52-year-old Gillian Ewing also died.Crown Office lawyers decided not to prosecute Clarke on the basis