This handout photo provided by the French Police Nationale sent to French police authorities on Feb. 24, 2017, shows portraits of the missing Troadec family. From left, father Pascal Troadec, mother Brigitte Troadec, son Sebastien Troadec, and daughter Charlotte Troadec.

Demonstrators in western France have tried to block buses carrying supporters of far-right presidential candidate Marine Le Pen to a campaign rally. The incident Sunday in the city of Nantes came after 11 police officers were injured Saturday in skirmishes with activists opposed to Le Pen’s appearance there.