French President Emmanuel Macron was slapped in the face by a man on Tuesday during a visit to  south eastern France.

Two people have been detained by police over the incident.

The man, who was wearing a mask, appears to have cried out “Montjoie! Saint Denis!” a centuries-old royalist war cry, before finishing with “A bas la Macronie,” or “Down with Macron.”

Former President Francois Hollande of the Socialist Party tweeted that the assault is an “unbearable and intolerable blow against our institutions … The entire nation must show solidarity with the head of state.”