French authorities say a migrant has died in the Channel Tunnel between France and England.

The reported death Tuesday came shortly after Eurotunnel reported a group of migrants was found in the tunnel leading from Calais in northern France. Thousands of migrants are camped in Calais, living in dire conditions as they hope to reach a better life in Britain by stowing away on trucks as they wait to be loaded onto freight trains for the trip.

The local prefecture confirmed the death but offered no details.

The encampments have heightened tensions between France and Britain, with each accusing the other of failing to deal with the situation.