A union representing Border Force workers at a crowded Kent immigration center said the Home Office hopes to get 400 people out of the site on Tuesday.

Lucy Moreton of the Borders, Immigration and Customs Union (ISU) added that the Home Office had not responded to their requests for increased support for staff working at the Manston processing centre.

The site, located in a former MoD fire training facility, opened in January 2022 and was designed to accommodate up to 1,600 people for up to 48 hours.

However, on Monday Sir Roger Gale, Tory MP for North Thanet constituency, which includes Manston, said 4,000 people were currently being held at the site and the situation there was a “breach of humane conditions”.

At least two coaches with heavily tinted windows were brought to the site on Tuesday – and Ms Moreton said they were brought in with the intention of moving some people to more suitable accommodation.

However, she criticized the Home Office’s lack of response to calls from the ISU for better staff support.

Speaking to the PA news agency, Ms Moreton said: ‘I understand there are now coaches on site with the intention of moving some migrants to more suitable accommodation.

“I don’t know yet how many will go today, but yesterday we were told the aim was to move 400. No coach has left yet.

“Unfortunately, nothing is being done to ease the pressure on the staff.

“We have asked the Home Office for increased support, welfare and mental health services and assurances to address staff concerns about the legality of the instructions given to them, the short and medium term sustainability and any ongoing threats to staff.

“The Interior Ministry has not responded.”

On Tuesday afternoon, a Home Office spokesman said it would not provide a ‘running total’ of the number of people currently in the center of Manston.

The Home Office has been contacted for comment.

Meanwhile, the British Red Cross said ‘immediate action’ must be taken to remedy the situation in Manston.

Alex Fraser, director of refugee services and restoring family links at the charity, said: “We are extremely concerned about the escalating humanitarian situation in Manston.

“It is clear that immediate action is needed to ensure that men, women and children who have just completed a dangerous and potentially traumatic journey have their basic needs met in a safe environment.

“No one should live in overcrowded housing that puts them at risk of disease and potentially illegally detained. We know, thanks to our work supporting people in similar temporary accommodation, what a harmful impact this can have on them.

“Unfortunately, the serious problems in Manston are indicative of wider problems facing the asylum system.

“The UK government must urgently consider ways to reduce the backlog of asylum decisions, including making faster decisions for nationalities whose asylum claim is generally approved and providing safer routes so that people who have been forced from their homes do not have to take dangerous journeys and gamble with their lives.

“Our country is proud to have helped people fleeing war and persecution. No matter how you got here, everyone deserves to be treated with compassion and humanity once you’re on our shores.