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The video was shared by Twitter user Jade Evans, who said a number of police cars had arrived to 'remove them'.
She wrote: "Carnage in Dover! These t**ts have superglued themselves to the A20.
"The amount of police cars they have here to remove them is causing more pollution than you know #ExtinctionRebellion."
Evans continued: "This is THE biggest waste of police time. There must be at least 500 of the force out here today. A waste of resources to clean up their wounds because they have ripped their skin off due to the superglue.
"It annoys me the most as I'm currently setting up a business that is 100% sustainable and eco-friendly.
"So I'm trying to better for our planet and you guys are just wasting my time rn."
Many others on social media angered by the scenes, with someone tweeting: "Using superglue (not environmentally friendly) requiring lots of police (again using energy) queues at port idling engines = more emissions."
Another person said: "They're clearly very f***ing stupid.
"Let's superglue our selves to a road and cause a massive traffic jam and let people just sit there with their engines running because that will help the climate."
According to the Press Assocation, two lanes at the busy Kent port were fenced off and taken over by the environmental activists amid a heavy police presence.
Ferry operator DFDS confirmed that there was an incident involving protestors 'blocking' exit routes.
DOVER PORT l All Vessels currently coming into the Harbour will be Berthed but discharge will be held. This is due to protesters outside of the Port blocking the exit routes. We are working with POD Police to minimise disruption and resolve as soon as possible pic.twitter.com/TXH6tDkRGH
- DFDS UK Updates (@DFDSUKUpdates) September 21, 2019
DFDS said it was working with Port of Dover Police to 'minimise disruption and resolve as soon as possible'.
Port of Dover also said there had been delays in the area, tweeting: "Traffic is moving in to the Port, but we are experiencing intermittent delays due to the protest."
A spokesperson for Kent police said that the stunt could lead to 'enforcement action'.
They said: "Following consultation with partner agencies, including the Port of Dover and Highways England, a designated area has been created in Townwall Street to allow a peaceful protest.
"The event organisers have been notified of this and, in order to ensure the protest remains peaceful, a small number of attendees have been advised that choosing to leave the designated area to cause disruption, or inciting others to cause disruption, could lead to proportionate enforcement action."
Chris Atkins from Extinction Rebellion Dover said: "As climate change develops, millions of ordinary Britons will face the real and growing threat of food shortages, hunger and starvation.
"Extreme storms and floods are already causing major crop failures across the world, with high temperatures also hitting livestock agriculture.
"This crisis may seem far away now but given the dependency of the UK on food imports we are extremely vulnerable.
"The Government must tell the truth and act now."
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