Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. Separately, a boat carrying 11 migrants, including two teenagers, was rescued off the coast of Boulogne by French authorities in the early hours of Friday morning after it capsized.The migrants managed to phone authorities and were located by a nearby fishing boat. Some had managed to climb onto the boat’s hull, while others were in the water. “Several” were suffering from mild hypothermia and one had a knee injury but none required hospital treatment, according to the local coastguard.In a statement, regional authorities for the Manche and North Sea said that conditions had been calm near the coast but “agitated at sea”.The local state prefect warned migrants against “crossing the Channel, one of the world’s most frequented zones and thus dangerous for human life”.In July, a man attempting to swim across the Channel wearing flippers was picked up by French authorities and returned to Calais. Border force yesterday intercepted 30 migrants crossing the English Channel, two of which were travelling in a kayak. Two minors, both believed to be teenagers, 27 men and one woman travelling in four separate vessels were stopped by authorities. They identified themselves at Iranian and Afghan nationals. The migrants were travelling in rigid-inflatable boats and two people were recovered from a kayak. Border Force was alerted to the first incident at around 4am on Friday and deployed a coastal patrol vessel and cutter which intercepted the group. It received a final alert at 7am.The occupants of the four small boats were transferred to Dover where they were medically assessed and deemed to be well. They were subsequently transferred to immigration facilities for interview. A Home Office spokesman said anyone crossing the channel in a small boat is taking a “huge risk with their life and the lives of their children”. Since January more than 60 people who arrived illegally in the UK in small boats have been returned to Europe.HM Coastguard said it coordinated the search and rescue response to a number of incidents off Kent with Kent Police and Border Force. “HM Coastguard is only concerned with preservation of life, rescuing those in trouble and bringing them safely back to shore, where they will be handed over to the relevant partner emergency services or authorities,” a spokeswoman said.