A few years back I was sat in an HGV in the yard of a large shop when a young scrote was pointing one of the devices at me....I called the local police station whilst he continued to do it,
I was most surprised when the female police operator seemed totally uninterested and went on to tell me they had nobody to help me at that time,
What can you do if the authorities show little interest...I was disgusted.
Tell her you saw them point it towards what you thought was a police car on a nearby road, they might take more interest then.