Brazilian club Corinthians, who will occupy the Sao Paulo stadium upon completion, issued the following short statement on their website:
The board of Corinthians Paulista Sports Club deeply regrets the accident earlier at Corinthians Arena.
No other information at this time.
More top news
The man was taken early this morning to a south London police station where he remains in custody.
The Chancellor faces tough talks to build a Government while also dealing with the challenge from a resurgent far right.
Watch John McDonnell's speech at Labour Party conference 2017 live as he speaks to Brighton the audience from 12.15pm.