If you are involved in an accident, in which people are killed or injured, are you allowed to start removing its effects - clean, prepare the tram for towing etc.?

In the event of an accident involving fatalities or injuries, it is strictly prohibited to take any action that could make it difficult to establish the circumstances of the incident. Altering the scene of the accident is prohibited, as this may obscure traces and destroy evidence crucial to the investigation conducted by the Police and the prosecutor.