Sunday's shootings occurred less than five months after a gunman killed five police officers in Dallas, Texas who were monitoring a protest against high-profile police shootings of black men.
Pirms nepilniem pieciem mēnešiem uzbrucējs Dalasā, Teksasā, nošāva piecus policistus, kas uzraudzīja kārtību protesta akcijas gaitā.