The mayor of Janos told local media that Fidel Alejandro Villegas, municipal police chief of Janos, was taken into federal custody for suspected links to the crime and consequently transferred to Mexico City. It continues to be unclear what role they usually have played.
The nine victims were dual Mexican-US citizens and part of the extended LeBaron Mormon family which settled in the plains and hills of Sonora state decades ago near the US border.
Mexican officials believe they were killed after becoming embroiled in a dispute between local drug cartels battling for control of the area.
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President Trump considered designating Mexican drug cartels as terrorist organizations following the massacre and raised questions about Mexican President Andres Manuel Lopez Obrador's strategy in taking on the ruthless criminal groups.
LeBaron told Aristegui News that he is not surprised by a high-level officer's involvement in the case.
The arrest of Villegas confirmed that Mexican law enforcement cooperates with drug gangs, LeBaron said.
The three women and six children were "ambushed" as they travelled in a three-vehicle convoy to a wedding.