chloe heyworth at the natural history museum. just to recap what the police are saying.rom metropolitan police. they say they were called at around 20 past two to reports of a collision in exhibition road in south kensington, where the natural history museum is. it is believed a number of pedestrians have been injured. 0ther emergency services including the london ambulance service, on the scene. london ambulance service, on the scene. a man has been arrested at the scene. and the police say enquiries are on to establish the circumstances and motive of this incident. they are asking people with information to call them. that is what we are hearing from the metropolitan police at the moment. we will keep a close eye on the situation and return as soon as we have more information. huge rallies are taking place across spain, as tensions continue over catalonia's demand for independence. in madrid, tens of thousands of people are showing their support for spanish unity. across the country campaigners calling for dialogue between madrid and barcelona have gathered outside tow