Almost one in three children who moved from the so-called Calais Jungle refugee camp after it was demolished have already gone missing, according to a report by a youth organisation.

The Refugee Youth Service (RYS) monitored 179 children displaced by last month's evictions, of which 56 per cent are now living in France's children's homes, 8 per cent moved legally to the UK and 2 per cent were sleeping rough. Yet another 30 per cent could no longer be found.

Bulldozers rolled into the makeshift settlement in mid-October, which had been home to around 9,000 people and became a symbol of Europe’s inability to deal with an influx of refugees fleeing war and poverty.

Calais 'Jungle' exodus begins as hundreds queue in darkness

Almost 1,700 children were moved from the unofficial refugee camp to the care of the French state to live in accommodation centres on 2 November.

But in their report, the RYS warned that a lack of age and language-appropriate services was contributing towards the deteriorating mental health of many of the refugee children.

“This continued uncertainty and confusion escalates the children’s negative feelings of hopelessness and self-worth,” said child protection officer Karen Moynihan.

RYS co-founder Ben Teuten said: “We saw it in the southern evictions in March where 129 children are known to have disappeared and are witnessing it again now.

"A third of the 179 children RYS were tracking in the October evictions cannot currently be located.”

There were around 2,000 child migrants in the camp when it was demolished in October (AFP/Getty Images)

“These are some of the most vulnerable children in the world, they have been let down time and time again.

"When they disappear we are extremely concerned that they will be preyed upon by traffickers and are unlikely to seek state support due to their treatment to date.”

RYS has worked in the Calais camp since November 2015. Before the camp's demolition, the group kept track of the minors by meeting with them once a week, but since the camp eviction have had to resort to a phone distribution system.

They say this has hindered their ability to keep track of the vulnerable group.

RYS says it has been unable to establish a proposer relationship with missing children’s services in France and complained that there is no clear process for reporting children missing in the country.

Citizens UK Leader, Rabbi Janet Darley, said: “Children's lives are in danger as they again, having lost faith in the system, take matters into their own hands.

Calais refugee camp evacuation Show all 15 1 /15 Calais refugee camp evacuation Calais refugee camp evacuation Refugees run past a fire in the makeshift migrant camp known as 'the jungle' in Calais, October 2016 AP Calais refugee camp evacuation French authorities say the closure of the slum-like camp in Calais will last approximately a week in what they describe as a "humanitarian" operation, October 2016 AP Calais refugee camp evacuation A painted message saying 'Bye Jungle' on a tent in the camp in Calais, October 2016 Getty Calais refugee camp evacuation Refugees set rubbish bins alight as a protest in the makeshift camp 'the Jungle' in Calais, France, October 2016 EPA Calais refugee camp evacuation French riot police advance through tear gas and smoke from a fire to disperse refugees throwing stones and lighting fires at the Jungle migrant camp Getty Calais refugee camp evacuation French CRS riot police secure an area on the eve of the evacuation and transfer of refugees to reception centers in France Reuters Calais refugee camp evacuation Journalists run away from smoke during clashes near a makeshift refugee camp known as 'the jungle' in Calais AP Calais refugee camp evacuation French CRS riot police secure an area on the eve of the evacuation and transfer of refugees to reception centers in Franc Reuters Calais refugee camp evacuation Migrants queue for transportation by bus to reception centres across France, from the 'Jungle' refugee camp in Calais Getty Calais refugee camp evacuation Refugees line-up to register at a processing centre in the 'jungle' near Calais, northern France, as the mass exodus from the migrant camp begins PA wire Calais refugee camp evacuation Refugees with luggage walk past a graffiti on a wall as they leave the 'Jungle' migrant camp, as part of a major three-day operation planned to clear the camp in Calais Getty Calais refugee camp evacuation French far-right Front National (FN) party's member of parliament Marion Marechal-Le Pen (L) delivers a speech next to a banner reading "They arrive in Vaucluse, no migrants in our place" as she attends a rally against the hosting of refugees in La Tour d'Aigues Getty Images Calais refugee camp evacuation French police forces secure the area near the 'Jungle' refugee camp in Calais Getty Calais refugee camp evacuation Refugees leave messages on their tents in the Jungle migrant camp Getty Calais refugee camp evacuation Refugees carry their belongings and transfer to reception centers in France

"Psychiatrists’ reports have shown that every day refugee children spend in limbo causes harm; the children have now been waiting for nearly a month.

"This is why we are calling on the UK government to fulfill their commitment to the children of Calais and transfer 1,000 to the UK before Christmas.”

Since the camp was razed, there have been reports that children living in the government's reception centres have been forced to work on fruit farms.

Josie Naughton, co-founder of the Help Refugees charity, said: "We are disheartened that once again children, the most vulnerable of refugees, have gone missing following the chaotic eviction in Calais.

"It is particularly worrying that alarm bells are not being raised. Both governments need to start to take responsibility for minors and provide them with adequate safeguarding to ensure they are properly protected and uphold their responsibilities according to the UN convention on the rights of a child.”