Protests for black man killed in police custody in Minneapolis erupt into violence in cities across US
                                
                                
                                    (Newser) -
                                    Demonstrators marched, stopped traffic, and in some cases lashed out violently at police as protests erupted Friday in dozens of US cities following the killing of George Floyd after a white officer pressed a knee into his neck while taking him into custody in Minnesota. In Phoenix, Denver, Las Vegas,...