At least 20 refugees dead after 4,000 rescued in single day

At least 20 refugees have died trying to reach Europe after their boat sank off the coast of Libya.

The death toll is likely to grow far higher, however, as the Libyan coast guard also reported two overturned boats between the coastal cities of Sabratha and Zwara. Only four bodies were found, raising fears that the rest of those on board had died.