At least 13 people allegedly involved in the killing of two members of Mexico City Mayor Clara Brugada's staff in May were arrested Wednesday for their alleged roles in what authorities described as a meticulously planned hit on two people close to the capital's leader.

Three of those arrested allegedly were directly involved in the killings and the others had roles in the logistics.

"In memory of our colleagues and out of respect for their families and friends, this government will not rest until the truth is known and justice is served," the mayor said in a statement posted on social media .

Brugada's personal secretary, Ximena Guzmán, and an adviser, José Muñoz, were shot dead in Guzmán's car on a Mexico City street in broad daylight on May 20. Guzmán, as she did regularly

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