"I am not ruling out any option," Arnaud Rousseau, the head of the FNSEA farming union, said when asked by France 2 TV if the protests could disrupt the Paris region.
The protests, heading into a second week after spilling over from neighbouring countries such as Germany, come as campaigning for European Union elections gathers pace. The unrest is the first major challenge for new Prime Minister Gabriel Attal.
The protests have blocked many important transport networks in southern France this week, and there have been signs that they are spreading.
