By KELIN DILLON Eight elected borough mayors from Union of Mayors of Mexico City (UNE-CDMX), all of which come from parties opposing current head of Mexico City Claudia Sheinbaum’s own leftist National Regeneration Movement (Morena), were beaten and attacked by city police after they approached the capital’s local congress on the morning of Monday, Aug. 30. Mayor-elect of Álvaro Obregón