Tour de France leader Geraint Thomas cleans his eyes after tear gas was used during a farmers' protest.

Tour de France leader Geraint Thomas cleans his eyes after tear gas was used during a farmers' protest.

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Tour de France temporarily halted by protesters; riders inadvertently tear-gassed

The Tour de France -- cycling's most prestigious race -- was temporarily halted Tuesday after tear gas, used to disperse protesters by police, inadvertently got into the eyes of some riders.