French police are warning young people about the dangers of a dare spreading on Facebook that has left a young man dead and another severely injured.

Police confirmed that a 19-year-old had drowned after riding his bicycle into a port in western Brittany while a friend filmed him.

Another youth was injured for life after diving head-first into shallow water near Calais.

The challenge dares people to jump fully clothed into icy water while friends film it.

"Don't be influenced by a stupid phenomenon of the moment," national police warned on Facebook.

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