Killer tracked French police officials days before murders

The killer who knifed to death two police officials in their home tracked the couple days before the murders and uploaded his claim of responsibility on the family computer, a judicial official in France has said.

As the investigation into the deaths on Monday continued, France paid tribute to the couple, Commander Jean-Baptiste Salvaing, an officer in Mureaux, a town west of Paris, and Jessica Schneider, a police administrator in nearby Mantes-la-Jolie.