One migrant has died and five people are in critical condition after a small boat capsized in the English Channel.
About 50 people were rescued when the boat ran into trouble in bad weather on Saturday morning, French authorities said.
One person was rushed to Calais hospital by helicopter but died of their injuries.
The rescued migrants are understood to have been taken to Dover.
Paramedics from the South East Coast Ambulance Service have been on the scene, the UK Coast Guard has confirmed.
Suella Braverman will chair an emergency meeting with Gold Small Craft Operational Command this morning.
A spokesman for the Maritime and Coastguard Agency said: “HM Coastguard is currently assisting French authorities, Gris Nez, in a search and rescue response to an incident involving a small boat in the Channel.
“HM Coastguard will continue to work with search and rescue partners to respond to people in distress in the UK’s seas and coastal areas.”
A Dover RNLI lifeboat manned with rescue teams from Folkestone and Langdon Bay helped the migrants out of the water.
The Interior Ministry said: “We are aware of an incident at the Canal. HM Coastguard is working on a coordinated response and further information will be provided in due course.”