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...