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

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 private secretary and an adviser to the mayor of Mexico City were shot dead by gunmen on a motorcycle in an attack in the Mexican capital Tuesday.