article_snippet: Several thousand, most from Sudan, Eritrea, and Ethiopia, are living either in the camps or sleeping rough on the streets of Calais.
article_snippet: Senior officials said 36,000 unlawful stowaways had been discovered since last April.
article_snippet: Sir Charles Montgomery, the director general of the Border Force, said 30,000 were found by British officers at Calais, while 6,000 were detained on UK soil.
article_snippet: In 2013-14, the number caught was half that, at 18,000, Sir Charles Montgomery, the director general of the Border Force said, but campaigners said the number who actually reached Britain was likely to be far higher, possibly in the hundreds of thousands.