A 10-year-old child and two 30-year-old women have died after a small boat that was attempting to cross the English Channel got into difficulty off the northern coast of France, French authorities say.

Authorities said they responded to a distress call from the boat, which was carrying 105 people, after it departed from Blériot Plage beach in Calais on Monday morning.

Three passengers were treated on board but were later confirmed dead by an emergency medical team flown out by helicopter, the French Maritime Prefecture of the Channel and the North Sea said.

Passengers were disembarked from a rescue boat at the port of Calais later on Monday morning, AFP news agency reported.