You sure this has even happened?
I stopped watching news it's half truths and lies and propergander this already sounds like a false flag. The powers that be want us all fighting each other and scared. I'm from UK so I'm sure I won't be able to avoid this.

EDIT

What source did you get this from here its a miner story yahoo and bbc both report it as 10 ingered and it was just a firework. It's a bit of a different report on the same thing.

https://www.bbc.co.uk/news/uk-england-london-43985271?ns_mchannel=social&ocid=socialflow_facebook&ns_source=facebook&ns_campaign=bbcnews