The camp – located just 30 minutes from Calais – was home to more than 1,500 migrants before it was reduced to a “pile of ashes” on Tuesday morning.
Now it is feared migrants may have to return to sleeping rough around Calais after destruction of the camp – the only official one of its type in France.
Charities have expressed particular concern about unaccompanied children at the camp. It is believed there were around 120 at the camp waiting to be reunited with family members in Britain.
Around 600 migrants, including 120 children, are missing following a fire at the Grand Synthe camp
The camp was left a 'pile of ashes' by the devastating blaze
Corenne Torre, the head of Doctors Without Borders in France, said around 600 asylum seekers are still unaccounted for, adding: “We just don’t know where they are”.
But around 900 people had been put up in local sports halls, the charity claims.
We just don’t know where they are
The massive blaze completely destroyed almost 300 huts at the site and left it completely uninhabitable after a reported brawl between migrants that left 10 injured.
Despite the extent of the fire, no one was killed.
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It is feared many migrants are sleeping rough around Calais
The prefect of France’s Nord region, Michel Lalande, said after the blaze: “There is nothing left but a heap of ashes.
“It will be impossible to put the huts back where they were before.”
Migrant crisis: Key locations before and after
Tue, April 4, 2017
In these composite images, a comparison has been made between a scene at a key location during the height of the 2015 migrant crisis last year and the view there now
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Aid workers help migrants up the shore after making the crossing from Turkey to the Greek island of Lesbos on November 16, 2015 in Sikaminias, Greece
And following a visit to former site of the camp, near Dunkirk, French interior minister Matthias Fekl said the government would not allow it to be rebuilt.
The camp had swelled in size after the closure of the infamous “Jungle” camp in Calais, which was just 23 miles away.
The sprawling camp, which was pulled down in October last year, was home to more than 10,000 refugees and migrants form the Middle East and Africa.
But there were fears late last year that many migrants were returning to the site in an attempt to board lorries and cross the Channel to the UK.