Leaders from six EU nations led by Britain held talks in Brussels on Friday on how to tackle the flow of migrants across the Mediterranean from Libya after a European naval task force plucked more than 3,100 from the water in just three days.
The nine who died were among several hundred migrants who were discovered aboard dilapidated boats off the port of Zawiya, west of Tripoli, on Saturday, Libyan Red Crescent spokesman Malek Mersit told AFP.
They included 11 children and 60 women, and were mainly Bangladeshis and Sudanese, he told AFP.
The drownings came just days after four migrants were killed in a boat fire off Libya and another 187 rescued.
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European leaders fear that a deal with Turkey to tackle the EU's worst ever migrant crisis will spark an acceleration in the already large number of crossing attempts from Libya.
Around 330,000 have landed in Italy from Libya since the start of 2014.