I'd love to know how they worked that cost out!
We had a small seige near here in Kew recently where two burglars took refuge on a roof and refused to come down (until one of the tossers managed to fall off ...

). It lasted a few hours and according to reports cost £25k in police, fire (for turntable) and ambulance (in case) services. As someone wrote in the local paper, the vast majority of resources used would have been on duty and being paid for anyway, with no additional cost incurred in back-filling by bringing in additional staff to cover for the resources used so whilst there may be an
opportunity cost there certainly wasn't a
real cost as in someone writing out a cheque.