Mayor Clara Brugada, who holds the second most powerful political post in Mexico, said her secretary Ximena Guzmán and adviser José Muñoz were killed.

The murders of two aides to Mexico City's Mayor Clara Brugada were meticulously planned by experienced gunmen, prosecutors said.

By Diego Oré and Aida Pelaez-Fernandez MEXICO CITY (Reuters) -Two top aides of Mexico City Mayor Clara Brugada were shot dead after being ambushed by gunmen on a motorbike in a daytime attack in the city center on Tuesday.