Crowds of anti-vaxxers have stormed the ITN building in London and chased after presenter Jon Snow.
More than 100 people have been pictured inside the building, which is home to the news divisions of ITV, Channel 4 and Channel 5.
There was a large police presence at the scene on Monday afternoon as the crowd descended on the broadcaster's base.
It is believed that the group are angry about vaccine passports.
They have since left the scene and moved on to protest outside Google's headquarters in King's Cross.
Police have been pictured forming protective lines outside the tech giant's building to stop the protesters from crowding in.
A man on a loudhailer can be heard telling the crowd at Google was giving them "the wrong information".
News correspondent Dan Rivers posted on Twitter earlier: "Protesters have just entered the reception of ITN. Heavy police presence here now."
It comes after a similar mob stormed into a former BBC building earlier this month, unaware that it had not been used for nearly a decade.
The Met Police said officers are responding to a "demonstration" where people had "unlawfully gained access to the building".
The force said: “Officers are on scene engaging with building security and removing those who have gained entry.”
In a brief statement on Twitter, ITN wrote: "As per below, police are attending ITN’s central London headquarters following a breach of security.
"ITN staff, including those working for ITV News, Channel 4 News and 5 News, have been advised to either stay in the building or stay away while the situation is being dealt with."
ITV news editor Emma Burrows wrote on Twitter: "Journalists should not be intimidated for doing their jobs."
Journalist Julian Druker wrote: "Demonstrators from an ‘anti-health passport rally’ have breached security and are now in the reception of ITN in central London."
In one video a protester is seen telling staff in the reception area: "We want to speak to who's in charge, we're not leaving."
Another bellows: "“They’re coming for our children.”
Vaccines have been approved for 16 and 17 year olds on a voluntary basis.
As pictures and video of the demonstration were shared on social media, Labour MP David Lammy wrote: "This is horrendous. @jonsnowC4 is one of the UK’s finest broadcasters – but all journalists should be free to do their jobs without harassment, intimidation or abuse."
Following the incident, the Metropolitan Police said: "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.
"Officers are on scene engaging with building security and removing those who have gained entry."
On August 9, a crowd thought to be made up of anti-vaxx protesters tried to gain access to the BBC's old headquarters in White City, west London.
However the premises is now actually used to film ITV's talk show Loose Women.
The Mirror has approached Google for comment.
