LONDON (Reuters) - London police said they were keeping an open mind after a car collided with pedestrians outside the city s Natural History Museum, contradicting an earlier comment that they were not treating the incident as terrorism-related. A spokeswoman for the London force said counter-terrorism officers were assessing the incident but had not yet reached a conclusion as to the circumstances. Earlier a spokesman told Reuters it was not being treated as a terrorism-related incident at this stage. 