Climate activists posing as tourists superglued themselves around the Speaker's chair in Britain's House of Commons chamber in London earlier today.
Extinction Rebellion campaign group posted a photo on Twitter showing several members hand-in-hand in front of the seat, with two other members holding up signs.
The Metropolitan Police said in a statement: "Four protesters who were present in the chambers and had glued themselves to each other were de-bonded and arrested.
"There has been no damage to the Speaker's chair.
"A protester who glued himself to the pavement inside the Palace of Westminster was de-bonded and arrested. A protester who climbed onto some scaffolding within the PoW came down of his own volition and was arrested.
"All of the above six individuals were arrested ... two protesters who locked themselves to the Carriage Gates were removed and arrested."
The statement said that all those arrested have been taken into custody.
"A police investigation into the incident is now taking place in close liaison with our parliamentary security colleagues to establish the full circumstances of the incident."
House of Commons Speaker Lindsay Hoyle said an investigation into the Extinction Rebellion protest has been launched by Metropolitan police and parliamentary security.
He said: "The incident on the parliamentary estate has now been resolved. Arrests have been made and there are no longer any protesters on the estate.
"It is a real shame that those visitors who made arrangements to join tours of the Palace of Westminster today had their visit disrupted and cancelled."
An XR activist, who would only give his name as Al from Northamptonshire, said demonstrators had smuggled banners into the Commons chamber in a "bag within a bag".
He said: "The action today was to form a circle around the Speaker's chair. People glued themselves around the Speaker's chair, they didn't damage the Speaker's chair in any way, and they glued themselves to each other."
XR protester Joe Short, from Bristol, said: "I have locked myself to the railings outside the Houses of Parliament.
"It is part of a bigger protest which is about climate inaction but it is also about a citizens' assembly which is an alternative form of democracy which could be much more effective at dealing with problems like climate change."
Asked if he was uncomfortable chained to the railings and surrounded by police officers, Mr Short said: "At the end of the day, in the scheme of things, it is not such an uncomfortable position."
