The activists, from Extinction Rebellion, have already caused chaos across London by occupying roads and bridges since Monday. Police urged protestors not to target the airport and said they had “strong plans” in place. Extinction Rebellion are demanding the Government take more radical action to tackle climate change.
In a message sent to its supporters last night the group said: “Tomorrow we raise the bar.
“We are going to shut down Heathrow.
“For the Bank Holiday, we are halting swarming disruption and turning our focus to the aviation industry.”
Last year over 80 million passengers passed through Heathrow, the busiest airport in the UK.
More than 400 people have been arrested since Extinction Rebellion began their campaign of disruption on Monday.
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The group is still occupying several sites in London, including Waterloo Bridge and Parliament Square.
A spokesman for Heathrow commented: “We are working with the authorities to address any threat of protests which could disrupt the airport.
“Passengers should contact their airlines for up to date information on their journeys.”
In July 2015 activists from a different environmental protest group, Plane Stupid, chained themselves together across Heathrow’s north runway.
The protestors were found guilty of aggravated trespass and received suspended sentences.
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A spokesman for the Metropolitan Police commented: “We are aware of information that suggests the protesters will carry out a demonstration on Friday, 19 April in the vicinity of Heathrow Airport.
“We have strong plans in place that will enable us to deploy a significant number of officers to Heathrow and take firm action against any protester seeking to cause disruption at this location by committing criminal offences such as obstruction of the highway.
“The airport is part of our national infrastructure and we will not allow the illegal activities of protesters to cause further disruption and misery to thousands of travellers, many of them families, over Easter.
“We would urge any protester planning to attend Heathrow to strongly reconsider.”