The International Organization for Migration said Libya intercepted over 24,000 migrants in the Mediterranean this year, "but only 6,000 are in detention centers, the fate of others remains unknown".
At least 20 women and two children are among 57 people who drowned, says International Organization for Migration, citing survivors brought to shore by fishermen and coast guard.
International Organization for Migration, the United Nations' migration agency, urges the European states to take urgent steps to reduce deaths on sea routes to Europe.
A crisis hotline for migrants in distress accused European authorities of refusing to coordinate a search operation and laying full responsibility on the Libyan coastguard, who also declined to launch a rescue operation.
Hundreds of shaken survivors of the March 24 Daesh attack in Palma have streamed into the neighbouring town of Mueda and provincial capital Pemba, where they arrived via boat, foot and plane.
The International Organization for Migration said the intercepted migrants are among the 4,500 people who have been brought back to Libya this year after attempting the dangerous Mediterranean Sea crossing to Europe.
The International Organization for Migration says the cause of the fire, at the detention centre in war-torn Yemen's capital Sanaa, was not immediately clear.
Border pushbacks that deny migrants their right to apply for asylum and collective expulsions are illegal under international refugee treaties, which allow people fearing for their safety to seek protection.
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.
Libyan coast guard retrieves two bodies after a boat carrying migrants bound for Europe capsizes in the Mediterranean Sea.
Dozens of migrants and refugees have been stranded in the Mediterranean Sea in Malta's search and rescue zone for over 30 hours, UN migration agency says.
The UN says smugglers forced some 180 Ethiopian and Somalis off their boat into rough seas. Over 100 were rescued, six confirmed dead. This was the second such incident in the past two days.
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