Wandering into town tonight to do a small job, I came across an unoccupied building with the alarm activated. A quick check around the site led me to decide that it was very probably a false alarm, possibly being set off by today's violent weather.
Not having a phone on me anyway, I decided not to alert the cops about it, on the basis that they probably had better (real) things to do and, as it was their own alarm that was going off, they would probably find it when they popped in for a cup of tea at some point during the evening.
Thinking about it afterwards, the tools that I had in my pocket at the time would have looked potentially along the lines of 'going equipped', as the saying goes...