The Beeb are doing a good job factual reporting. https://www.bbc.com/news/articles/cd1d31jeyzlo
A security failure allowed a man with a rifle onto the building next to the stage. https://www.bbc.co.uk/news/live/cljy6yz1j6gt?post=asset%3A59e57ed7-c028-4616-9b54-92c855d42644#post