French police are investigating the source of upholstery tacks that led to in the Tour de France on Sunday. The tacks were strewn about the crest of the final day鈥檚 climb and caused chaos in the field as defending Tour champion Cadel Evans punctured three times and Robert Kiserlovski crashed out with a broken collarbone. Tour leader Bradley Wiggins went to the front shortly after the carnage began and instructed the field to wait for Evans and a host of other dropped riders before flatting himself. Despite an attack by Pierre Rolland that was reeled in, there were no flat-caused changes in the overall classification at the end of the stage. Riders and managers were unsure of what led to the incident, but were uniformly incensed after the stage. 鈥淭hat doesn鈥檛 stand up to me. That smacks of cowardice,鈥 said Sky manager Dave Brailsford at the team bus. 鈥淚f people want to speak their mind, that鈥檚 fine. But why put people鈥檚 lives at risk?鈥
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