The boat carrying migrants from Bangladesh, Syria, Egypt, Sudan, Eritrea, and Mali had set off from Zuwara, on Libya's northwest coast, the humanitarian organization said.
Over 380 other irregular migrants were rescued by Tunisian coastguard teams at the same time.
In 2021, About 900 irregular migrants have so far died while attempting to cross the Mediterranean Sea to reach Europe, according to the International Organization for Migration (IOM).