The Legoland amusement park in Günzburg, in German Bavaria, was the scene of a tragic accident on Thursday afternoon.
Two small trains of a roller coaster that can carry up to 20 people collided.
While the first train was at a standstill, the second failed to brake sufficiently "for an undetermined reason" and crashed into it, police said in a statement.
The shock injured thirty-one people, one of them seriously.
Among the injured are ten children, a teenager and a 20-year-old, according to the same source.
A total of sixteen people had to be hospitalized, but no details were given on the condition of the seriously injured person.
This amusement park is one of the best known in Germany with its 64 attractions, including the "roller coaster" carousel for thrill seekers.
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