MEXICO CITY — 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 allegedly had roles in the logistics.

Brugada’s personal secretary, Ximena Guzmán, and an advisor, 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, was picking up Muñoz at a subway station.

“These results represent the first advances of an ongoing investigation,” Brugada said.

Bertha María Alcalde Luján, Mexico City’s chief prosecutor, said l

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