Noname and Z-Pentest Alliance are claiming responsibility - but this is being met with scepticism.
source https://www.bbc.co.uk/news/articles/c8vgxyvz6y9ro?at_medium=RSS&at_campaign=rss
source https://www.bbc.co.uk/news/articles/c8vgxyvz6y9ro?at_medium=RSS&at_campaign=rss