PARIS (AP) — A French official says three men and three women have been detained in the investigation of the 2016 slaying of two police officers in their home in the name of the Islamic State group.

A judicial official said the arrests on Monday were aimed at determining the roles, if any, that the individuals may have had in the killings of the couple at their home in Magnanville, west of Paris.

The official refused to confirm French press reports that one of the women detained in the sweep in Les Yvelines — where Magnanville is located — and the Val d’Oise is herself a police officer. The official was not authorized to speak publicly.

Larossi Abballa stabbed the couple before police killed him. The couple’s 3-year-old son survived.