The protesters do not resist to arrests and majority are released in a few hours after giving statements at police stations.
'Over recent days, commuters trying to earn a living have been unable to travel to work and businesses have been disrupted, ' he said.
Scotland Yard has arrested at least 428 protesters amid ongoing demonstrations across central London - at Waterloo Bridge, Marble Arch, Oxford Circus and Parliament Square.
"The serious disruption the demonstrations are causing to people in London and beyond is unacceptable and we completely understand the concern it is causing to those who are disrupted by it", a tweet said.
On Friday, Oscar-winner Thompson - known for "Sense and Sensibility", "Saving Mr. Banks" and "Love Actually" - joined protesters in the brilliant Good Friday sunshine at Oxford Circus.
The protesters call themselves "Extinction Rebellion", and are part of an worldwide group of climate change activists committed to "showing the world" they "will not idly stand by while the earth burns" according to the official website.
An airport spokesman said: "We are working with the authorities to address any threat of protests which could disrupt the airport".
One person on Twitter who identified herself as a British police officer lamented the decision, while also chiding the protesters for the effects of their actions, which some have said aren't so environmentally-friendly.
Speaking to reporters, she said: "I feel massively inspired by this generation and want to stand with them".
Police have said they expect the demonstrations to continue in the next few weeks.
In many cases, protesters lay down on roads and bridges, with some reportedly gluing themselves to trains.
Extinction Rebellion has called for non-violent civil disobedience to push the British government to reduce net greenhouse gas emissions to zero by 2025 and to stop what it says is a global climate crisis.
'While we fully support the right to peaceful protest, we do not believe that it is acceptable to block, for such a long period of time, some of London's busiest streets'.