Five environmental activists have been arrested over plans to fly drones near Heathrow Airport on Friday.
Climate change activist group Heathrow Pause said it aims to use devices within the no-fly zone as part of efforts to halt the airport’s planned expansion.
Police made the arrests in Bethnal Green and and Highgate on Thursday.
The group said it had up to 70 more pilots available to fly drones and will “carry on exactly as planned”.
The activists were arrested on suspicion of conspiracy to commit a public nuisance.
Laurence Taylor, the Metropolitan Police’s deputy assistant commissioner, said: “Earlier today, three men and two women aged between their 20’s and 50’s were arrested on suspicion of conspiracy to commit a public nuisance in relation to operations at Heathrow Airport on Friday, 13 September.
“We believe these arrests to be a proportionate response to preventing criminal activity that could significantly impact on a major piece of national infrastructure.
“We remain fully prepared for the planned protest tomorrow, and will work quickly to identify criminal activity and arrest anyone committing offences.”
Heathrow Pause said in a tweet it would “not be silenced”, adding: “We are parents protecting our children.”
In a separate post, it said: “The action will carry on exactly as planned, peacefully and non-violently, regardless of today’s events.
“We have contingency measures in place.”
Police officers said on Wednesday they were “confident” they would be able to prevent any disruption caused by protesters who plan to fly drones near Heathrow Airport on Friday.
Scotland Yard previously warned activists could face possible life sentences if they fly drones around the airport in a bid to ground flights.
A spokeswoman for Heathrow previously said airport chiefs “agree with the need to act on climate change” but “committing criminal offences and disrupting passengers is counter-productive”.