The police knew, but elected not to interfere. This is where the paralysis of political correctness becomes criminally negligent and suicidal.
I guess the Brits don’t have guns, but they have a bunch of camel fellating morons addicicted to a Death Cult killing them in the name of Allah...while the busybody bureaucrats think of more ways to tear crosses down and provide more aid and welfare to the oncoming hordes of Arabs and Persians.
“If we’re just niiiiice, they will LIKE us.”
How about we shoot them as I do not care if the like me.