Top Notch Investigation

In a perfect case of the left hand not knowing what the right hand is doing, police in London approved the rental of a city street for the filming of a gunfight scene. In fact there were officers on site during the 3 days of filming. At the end of filming members of the production crew swept up shell casings, as best they could I'm sure, from the 1,700 blank rounds that were fired. The next day someone called the police and reported suspected gun play in the same area. Forensics investigators combed the street and found a few shell casings. The following day, when tests showed the casings were from blank rounds, apparently the penny dropped for someone about the filming. Did the police then smile, slightly embarrassed, and say 'our bad' and let it go? Nope, they threatened to charge the business that secured the rental for filming with wasting police time.