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.
The victims were the mayor's private secretary, Ximena Guzman, and an adviser to Brugada, Jose Munoz, according to a statement from the city.

The assassinations have sent shockwaves through Mexico's capital, widely regarded as an oasis of relative security in a country plagued by violence. Political violence has become common in many parts of Mexico, where scores of local political candidates have been assassinated in killings usually linked to drug cartels seeking to exert influence.