 The producers were under the impression that they had been given  full permission from the police for the filming of the raid sequence  which was due to take place in an underground tunnel near Waterloo  Bridge in London. The actresses were all running around in  balaclavas, brandishing machine guns, when an armed response unit  from the police suddenly showed up, having been tipped off by  alarmed onlookers who believed they were witnessing a real raid  taking place. It took a bit of explanation on producer Linda Agrans  part to convince them that it was all a mistake.