More than 50 people arrested in connection with an ongoing series of environmental protests targeting the M25 and Port of Dover have been released under investigation. Police officers made 53 arrests after the Insulate Britain demonstration at junction 14, near Heathrow, on Monday. Members of the Extinction Rebellion splinter group, which calls for the UK government to fully fund an overhaul of the insulation of all homes in Britain by 2030, glued themselves to each other, barriers and the carriageway. The activists, who have blocked the M25 six times in just over two weeks, continued their campaign despite a high court injunction that could result in them being imprisoned, fined heavily, or having their assets seized. As well as targeting the London orbital motorway, protesters have blocked other important routes including the A1(M) and A20 near the Port of Dover. The group claims 438 arrests have been made, including some Insulate Britain supporters who have been arrested multiple times. But despite the high number of arrests, the campaigners say only two people have been remanded in custody. On Tuesday, the group tweeted: “Injunction? What injunction?” The Metropolitan police confirmed that all those taken into custody on Monday had been released under investigation. Kent police revealed that one person had been charged in connection with an earlier Insulate Britain protest, out of 96 arrests made by the force. In an open letter to Priti Patel, the home secretary, Insulate Britain vowed to continue its campaign in the face of arrests and injunctions. It said: “We are more fearful of the loss of our country than we are of you. You can throw as many injunctions at us as you like, but we are going nowhere. “You can raid our savings. You can confiscate our property. You can deny us our liberty and put us behind bars. “But shooting the messenger can never destroy the message: that this country is going to hell unless you take emergency action to stop putting carbon into the air.” After the release of the 53 people from police custody, a Department for Transport spokesperson said: “The right to protest is a fundamental principle of our democracy, but we will not tolerate the guerrilla tactics we have witnessed over the last two weeks. “That is why we sought injunctions to put an end to this behaviour, which wreaks havoc and puts people’s lives in danger.”