The grandmother of the French teenager shot dead by police during a traffic stop pleaded on Sunday with rioters to stop as the nation faced a sixth straight night of unrest, while authorities expressed outrage by the targeting of a mayor’s home with a burning car that injured family members. The grandmother of 17-year-old Nahel, identified only as Nadia, said in a telephone interview with French news broadcaster BFM TV, “Don’t break windows, buses … schools. We want to calm things down.” She said she was angry at the officer who killed her grandson but not at the police in...