PARIS - Ten people were arrested in an anti-terror operation in France and Switzerland on Tuesday including a Swiss man linked to a foiled knife attack by a French teenager, sources close to the probe said. A 27-year-old Swiss man arrested in France was in contact with a 14-year-old French boy who was "about to carry out the attack," one of the sources said. The teenager was arrested in the Paris region on June 20 and charged by an anti-terror judge, the sources said. A photo of the boy holding a paper vowing his allegiance to the Islamic State group was found on social media, they added.