This article - Some families 'feel unsafe' after group puts up flags on lampposts describes a group of men hanging UK Union flags on lamp-posts in a "mixed area", (itself a provocative act) and, crucially, threatening to burn the houses of anyone who interferes with them.
However, one local was apparently told by the police that "there is nothing we can do" since they weren't paramilitary flags.
First of all, I would have thought that since the flags are being hung on public property, the police would surely be able to take them down (seeing as the residents themselves are, no doubt, afraid to),
But the real question is, why can they do nothing about threats to burn down people's houses? Surely this is a criminal act!