Everyone on here who’s screaming cover up and why haven’t the police described the perps yet - that was normal practice until Southport at which point all the dreadful stuff posted online changed things a bit. Police have a job to do finding evidence at this point. Journalists will tell you that information routinely wasn’t released until later and not for any sinister reason.
And for everyone saying something has to happen - well, what? Armed police on all trains? No funds or enough police (thanks austerity). Deport all asylum seekers? Not that simple especially since we Brexited. There aren’t any simple solutions, no matter what people like to tell you.