Thirty of the 70 migrants on board are feared to have drowned while making a desperate bid to reach Europe via the world's deadliest migration trail.
At least eight people killed and 20 others missing after an overloaded motorised passenger canoe broke in two.
Some 130 migrants bound for Europe are missing off the Libyan coast after a rubber boat reported it was in distress, independent rescue groups say.
A boat carrying 200 people sank a few hours after leaving a Senegal fishing town, marking the deadliest shipwreck recorded this year by the UN migration agency.
A Black Sea Maritime Archaeology Project team says the vessel, previously only seen in an intact state on the side of ancient Greek pottery, was found at a depth of more than 2,000 metres.
UN refugee agency confirms at least 700 refugees have drowned in the Mediterranean since Wednesday, while some estimates put the death toll at 900.
Italy aims to raise capsized fishing boat that sunk in Mediterranean Sea one year ago, containing drowned bodies of 800 refugees trapped inside
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