The BBC has ordered an urgent investigation after several intruders got into Broadcasting House on Friday night.
The group of five is alleged to have gained unauthorised access to a studio during a live broadcast around 7.30pm.
A video, allegedly showing the group behind the stunt, has since circulated on social media.
We take security very seriously and are urgently investigating
The 40-second clip shows a young man boasting: "Guys, right now, we are in the BBC headquarters and we are going to try and run on live television."
The camera pans around the inside of the BBC building, where rows of empty computer desks can be seen.
He is later seen walking outside and saying: "Guys, literally yeah, I ran on the set of BBC News and it is crazy."
The group, who also appear in the video to gain entry to the set of the One Show, where Ed Sheeran was performing, promise a full video will be made available on Sunday night.
It's out ! Bloody hell that feels good to say. Tune into Chris Evans this morning on radio 2, doing a session, then the one show later x— Ed Sheeran (@edsheeran) March 3, 2017
The intruders later left of their "own accord" and did not interrupt any broadcasts, the BBC said.
A spokesman added: "We take security very seriously and are urgently investigating how several individuals were able to gain access to a studio.
"No one was hurt and there was no interruption to broadcasts. We have already taken further security measures and will take any other necessary steps."