According to MANA, the dead were thought to be migrants rather than smugglers because they were sub-Saharan Africans, IOM spokesman Joel Millman said. More than 100 people were wounded, he told a news briefing in Geneva, citing information from colleagues in Libya.
The latest deaths come in addition to the 140 bodies found on Libyan beaches so far this year, while there have been 477 deaths at sea on the route from Libya.
So far this year 15,760 migrants have arrived in Italy, up from 9,101 in the same period of 2016, while almost 3,000 migrants have been rescued at sea and brought back to Libya, Millman said.
The number of migrants setting off for Italy by boat from Africa has risen more than 50 percent so far this year, after half a million people arrived during the past three years.
Italy is promising to send more migrants who do not qualify for asylum back home, either by force or with their consent.