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A fan holding a sign got too close to the riders, and caused the peloton to have a huge crash.
Source: SKY
The unnamed woman, brandishing a cardboard sign on the roadside which clipped German rider Tony Martin who fell to the ground, wiped out almost the entire peloton during the first stage.
The crash held up the race for five minutes while bikes and bodies were untangled. As a result, one rider had to pull out of the Tour and another eight riders were treated for injuries.
Video footage of the incident has been shared widely online.