Anti-vaccination protestors caused disruption at ITN on Monday and hurled abuse at presenter Jon Snow, causing the police to step in.
"Officers are responding to a demonstration at a private premises on Gray’s Inn Road, #Camden where people have unlawfully gained access to the building," the Metropolitan Police tweeted."
An ITN spokesperson said: "The police attended a breach of security at Grays’ Inn Road, ITN’s headquarters, earlier today. ITN take such breaches very seriously.
"The safety of our staff and journalists is of paramount importance. All personnel were advised to either stay in the building or stay away while the situation was being dealt with."