Mercedes: Unacceptable clash must never be repeated

Mercedes-Benz's head of motorsport Toto Wolff says the "unacceptable" collision between Nico Rosberg and Lewis Hamilton at Spa-Francorchamps "cannot - and will not - happen again".

Wolff said the accident, which occurred at Les Combes on the second lap, was a clear transgression of the fundamental rules Mercedes have laid down in an effort to allow the pair to race together