June 2020. Gunmen wounded Mexico City’s chief of police and killed two of his bodyguards and a bystander, in a brazen ambush on his vehicle as it traveled through a wealthy neighbourhood that is home to ambassadors and business leaders. The police chief, Omar García Harfuch, tweeted hours after the shooting that the powerful Jalisco New Generation Cartel was to blame. Mr. García Harfuch, who said he had been shot three times, was recovering in a Mexico City hospital. A dozen people were arrested following the shooting. The dawn attack further punctured Mexico City’s image within the country as an oasis largely shielded from the gruesome violence that has gripped other parts of Mexico.