Mexican prosecutors are alleging that a police commander helped set up the slaying of a nephew of the governor of the northern border state of Coahuila.

The Coahuila state prosecutor's office alleges that the official asked Jose Eduardo Moreira to meet him last week at the place where the killers were waiting.

The office's statement Monday identifies the suspect as Rodolfo Castillo Montes and says he is the assistant police operations director of the border city of Ciudad Acuna. The officer is under house arrest pending possible homicide charges.

Moreira was the nephew of state Gov. Ruben Moreira and the son of former governor Humberto Moreira.

Authorities say the killing may have been retaliation for the killing of a Zetas drug cartel leader's nephew in a confrontation with police.