At least 12 people have died after the capsize of a migrant boat in the English Channel. 

The French Coastguard has rescued more than 50. 

It's the deadliest disaster in the Channel so far this year. 

Downing Street is labelling the disaster "truly horrific", and says it's determined to further crack down on dangerous people-smuggling operations. 

UK Correspondent Gavin Grey told Ryan Bridge that more than 20,000 people have made the crossing from France to the UK this year, but the number of deaths has also risen significantly. 

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