A man has died after suffering cardiac arrest onboard a boat attempting to reach the UK.
The vessel turned back towards Equihen beach on the French coast yesterday morning.
A nurse tried to resuscitate the man but was unsuccessful.
French authorities have now launched an investigation into the circumstances.
A spokesperson for Doctors Without Borders, also known as MSF, has criticised authorities on both sides of the Channel.
Jacob Burns said: "Yet again we have a tragedy in the Channel, that is the consequence of the deadly, costly and ineffective security policies implemented by the UK and France."
Later on Saturday, a lifeboat carried migrants who have made the voyage into the Port of Dover.
Photographs showed them huddled under blankets and orange life jackets on board.
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