Patrol boats and helicopters searched on Sunday for about 48 migrants missing since their boat sank near the Spanish island of El Hierro in what threatens to be the deadliest such incident in 30 years of crossings from Africa to the Canary Islands.
Nine people, one of them a child, have been confirmed as dead after their boat sank in the early hours of Saturday morning, emergency and rescue services said.
Rescuers were able to pick up 27 of 84 migrants who were trying to reach the Spanish coast on Saturday. Three patrol boats and three helicopters were taking part in the renewed search on Sunday, a Spanish coastguard spokesman told Reuters.
The migrants were from Mali, Mauritania and Senegal, Spanish authorities said.
The emergency services received a call on Saturday shortly after midnight from the boat, which was located around four miles east of El Hierro. It sank during the rescue, they said.
Wind and poor visibility made the rescue extremely difficult.
"After what happened yesterday and if the forecast for the arrival of the migrant boats happens, then it will be the biggest humanitarian crisis to happen to the Canary Islands in 30 years," Candelaria Delgado of the Canary Islands government, told reporters on Sunday.
Three of those rescued suffered from hypothermia and dehydration, rescue services said on Sunday.
As hopes of finding more survivors diminished, police installed a morgue on El Hierro, authorities said.
Three other boats reached the Canary Islands during the night, carrying 208 migrants.
In some 30 years of migrant crossings to the islands the deadliest shipwreck recorded to date occurred in 2009 off the island of Lanzarote when 25 people died
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