The mayor of a northern French town has told Sky News that efforts to stem migrants coming across the Channel on small boats cannot be sustained, reports Sky News.
Migrants are thought to be using launch spots along a 30-mile stretch of coastline between Boulogne and Dunkirk - riddled with locations that are ideal to quickly put to sea in a small boat without being seen.
Franck Dhersin, mayor of Teteghem, said: "The French don't have enough patrols.
"We don't have enough police to be on every beach all the time. It's impossible. And we have many harbours and many little ships."
It comes amid fears that migrants could be losing their lives at sea, with authorities unaware of their deaths.
Gérard Barron, chairman of Boulogne lifeboat, says he believes tens of migrants have died over the past year making failed attempts to reach the UK by sea.