geneva unite nations appeal monday countries worldwide take 1,300 mainly african refugees strand libya many mistreat keep appal condition detention niger agree temporarily host vulnerable evacuate include unaccompanied children single mother pending process departure resettlement u.n. high commissioner refugees unhcr say statement order address immediate protection need extreme vulnerabilities persons concern evacuate niger unhcr urgently request 1,300 place resettlement situation agency say unhcr intend evacuate 700 1,300 people libya niger end january 2018 say call resettlement place make available end march first group 25 refugees eritrea ethiopia sudan evacuate libya niger last month add desperate call solidarity humanity need get extremely vulnerable refugees libya soon possible say volker turk unhcr assistant high commissioner protection image broadcast cnn early month appear show migrants auction slave libyan traffickers spark outrage europe anger africa number detainees swell boat departures italy smuggle hub sabratha largely block year friday international organization migration iom call social media giants make hard people smugglers use platforms lure west african migrants libya face detention torture slavery death facebook whatsapp reply request reuters comment u.n. seek 1,300 place refugees libya