Survivors saved by medical charity Doctors Without Borders (MSF) from a sinking rubber boat before dawn said six adults and four children were missing.
As the rescuers took 120 people to safety, there were fears that more may be missing at sea, an MSF spokeswoman said.
Nine bodies were found later in the day on another vessel, though their cause of death was unclear.
Along with the bodies of five migrants who died yesterday, they were transferred to the Norwegian Siem Pilot rescue ship, part of the Frontex European border security agency's mission in the Mediterranean.
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