David Cameron is in Brussels as EU leaders gather for an emergency summit to discuss the growing migrant crisis.
Speaking as he arrived, Mr Cameron said the crisis was “the greatest challenge facing Europe today”.
He made reference to the EU referendum, saying: “Even outside the EU we’d be affected by a migration crisis like this.”
The UK has announced it is sending a Royal Navy ship to help patrol the Aegean Sea between Greece and Turkey to help tackle the people-smuggling gangs trafficking thousands of migrants into Europe.
Speaking to Sky News, the Defence Secretary Michael Fallon said the Royal Fleet Auxiliary vessel Mounts Bay would be tasked with uncovering and disrupting the gangs trading in “human misery”.