Two children among four dead after migrant boat sinks off French coast

It is believed to be the single biggest loss of life during the current migrant crisis. 

A French rescue helicopter lands close to a rescue vessel in Dunkirk, northern France. Picture: AP

Four people including two young children have died after a migrant boat sank off the coast of France.

More than a dozen people have been taken to hospital and searches have been carried out for any others caught up in the tragedy.