The International Organisation for Migration (IOM) said on Tuesday at least 50 people had died after a vessel carrying 75 Sudanese refugees caught fire off Libya's coast on Sunday.
The IOM said it had provided medical support to 24 survivors.
Libya has become a transit route for migrants fleeing conflict and poverty to Europe across the Mediterranean since the fall in 2011 of dictator Muammar Gaddafi during a Nato-backed uprising.
As of February, around 867,055 migrants from 44 nationalities were residing in Libya, according to IOM data.
Reuters
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