WATCH: Spectator causes mass fall at the Tour de France

An unidentified spectator left cyclists injured after leaning into the road with a cardboard sign that read 'Allez Opi-Omi', which translates to 'Go Grandpa-Grandma.'

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Video footage of the incident showed the woman waving her sign at the passing TV motorbikes before wiping out most of the cyclists when Jumbo-Visma's Tony Martin crashed into it and went to the ground, causing the pile-up.

The footage went viral on social media, leaving people across the world speechless.

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Cycling reporter Daniel McMahon labelled it “the worst Tour de France crash I’ve ever seen” on Twitter.

According to The Daily Mail, prosecutors say that the woman could be charged with deliberately violating safety regulations and so causing injuries that might prevent someone from working for up to three months.

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Tour de France organisers are planning to sue the woman over the incident.

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Image Credit: Twitter/ Daniel Mcmahon @cyclingreporter