Four-time champion Chris Froome was among riders whose eyes needed treatment for tear gas when a farmers' protest interrupted the 16th stage of the Tour de France on Tuesday.
Bales of hay blocked the road 30 kilometres (18 miles) into the 218-kilometre (135-mile) leg from Carcassonne to Bagneres De-Luchon.
Tour organisers said police used tear gas to disperse the protesters as the peloton approached.
Froome, race leader Geraint Thomas, and world champion Peter Sagan appeared to be among those affected by the chemical, and were treated with eye drops.
