In this picture taken late Tuesday, July 29, 2014, firefighters try to set up a mechanical digger on a field near Isselburg, western Germany.
German authorities say a man was killed and five others injured when a mechanical digger tipped over and hit them during a so-called Cold Water Challenge, a dare that has been spreading on Facebook.
Prosecutors said on Wednesday 11 members of a bowling club in Isselburg, on the Dutch border, had filled the digger's shovel with 2000 litres (528 gallons) of water, which was to be poured over them.
However, as the shovel was lifted into the air, the digger tipped over and the shovel hit six of the men. Four of the injured were taken to hospitals following the accident late Tuesday.
In the US, several people have been injured participating in Cold Water Challenges, which typically involve dares such as jumping into cold water.