The shooting happened at night as bullets were fired at eight Iranian Kurds who were carrying a dinghy towards the water on a beach in Dunkirk.
Two men were hospitalized after being hit by bullets on September 22.
Those involved told the Daily Mail that they were not human traffickers but asylum seekers hoping to reach Britain.
A man told the newspaper: “There were eight of us holding the boat near the beach. We were preparing to launch it for 40 people who wanted to cross into your country.
“Then three or four policemen arrived in one vehicle. A police officer fired point blank at Juanro Rasuli. I don’t remember how many times they fired the rubber bullets.
“When the police saw us, they shouted stop, we stopped and they shot us anyway. Then we got away as best we could.
Mr. Rasuli, 24, is still recovering in hospital after suffering broken bones in his leg.
The incident took place five miles from a squalid migrant camp where hundreds of people wait for a boat to Britain.
Home Secretary Priti Patel has threatened to withhold £ 54million in payments from Britain to the French government for beach patrols in northern France if the number of migrant boats making the crossing to Great Britain was not diminishing.
The number of people who made the dangerous Channel crossing in small boats this year has reached 17,085.
This figure is double the total for all of 2020, when 8,417 people made the crossing.