Officers arrested 23-year-old man in Paris after he allegedly admitted he intended to set fire to one of the French capital's largest parks, a police source said Saturday.

Police were called late Friday to a blaze at the Bois de Boulogne park and found a fire spreading from a pile of brushwood to a tree trunk, the source said.

Officers put out the flames with fire extinguishers before they could spread further, but around one square metre of vegetation was burned.

A man at the scene told police he had intended to set the western Paris park alight and was taken into custody. Prosecutors said Saturday his detention had been extended.

The arrest comes as France remains shaken by a major wildfire in the Fontainebleau forest southeast of Paris that burned around 2,200 hectares.