French police used tear gas on Monday to disperse migrants trying to leave the northern French coast in an attempt to reach Britain.
Footage showed a group, some wearing life jackets, running back up the beach after police intervened.
A slashed dinghy was left on the beach at Petit-Fort-Philippe in Gravelines following the incident.
In a separate incident, three people, including a child, died while attempting to cross the English Channel from France to the UK, local authorities said.
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