More than 400 migrants are feared to have drowned after their boat capsized off Libya.
An air and search rescue operation has been launched by Italian authorities after the latest incident in the mediterranean.
The European Union says over 7000 migrants have been rescued in the area since Friday.
The EU says the flow of migrants from north Africa towards Europe via the mediterranean is 'unprecedented'.
EU correspondent Sandra Gathmann reports.
IN: "The EU...
OUT: ...step up."
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