Six people were killed including one woman and eight others were injured at different incidents of firing and violence in Karachi Thursday. Three people were shot dead in Saeedabad, New-Karachi and Clifton localities while the culprits were unknown, police source reported. Also, a car coming from Hub came under firing which left one dead and two injured. A girl was strangled to death in a domestic violence at the Oangi Town locality while eight people were injured due to street crimes occurred at other places, police sources told.