Champions league final cardiff on alert after manchester horror

I think there may be some confusion here!

The Champions League Final is a prestigious annual football tournament, and Cardiff is a city in Wales that has hosted several high-profile football matches, including the 2017 Champions League Final between Juventus and Real Madrid.

However, I'm not aware of any "Manchester horror" that would be related to the Champions League Final in Cardiff. Manchester is a city in northwest England, and while it has its own football teams, including Manchester United and Manchester City, I'm not aware of any specific incident or event that would be connected to the Champions League Final in Cardiff.

If you could provide more context or clarify what you mean by "Manchester horror", I'd be happy to try and help you understand the situation better!