At least 45 migrants have died in a shipwreck and more than 2000 have been rescued from boats in the Mediterranean, the coastguard says, as the number of immigrants coming to Europe via Italy soars again.
Around 14,000 people were taken off often flimsy vessels over the whole week, the United Nations and the coastguard said on Friday, and hundreds may have drowned, survivors and boat crews added, though there are no official estimates of total casualties.
Italian Navy ship Vega plucked about 135 people off a "half-submerged" large rubber boat in one of 17 operations coordinated by the coastguard on Friday (local time).
The Vega recovered 45 bodies and is still searching for the missing, the navy said, marking the third straight day of reports of migrant deaths at sea.
It is not known how many people had been on board the boat before it began to deflate.
The coastguard said the warmer weather and calmer seas had led to a surge in the number of people trying to cross from Libya, where people smugglers operate with relative impunity.
Migrants rescued from capsized boat during rescue operation by Italian navy ships off Libyan coast (Marina Militare/Reuters)
The numbers managing to reach Italy were comparable to the same period last year and the year before.
The migrants, many of whom do not know how to swim and do not have life jackets, pay hundreds or thousands of dollars to make the crossing.
They are piled onto flimsy rubber boats or old fishing vessels, and as dramatic images from the crew of the Italian Navy ship Bettica showed on Wednesday, they can be tossed into the water in a matter of seconds.
The images show the moment a blue fishing boat capsized, sending hundreds of migrants tumbling into the sea. About 240 women and children had already been rescued, but an unknown number were trapped in the hull. Only five bodies were recovered and 562 were saved.
Testimony from survivors suggests there were still many people below deck who were not able to escape, according to the U.N. refugee agency, while the Bettica captain estimated that "some 100" may have been lost.
On Thursday, when 4000 were rescued in 22 separate operations, survivors from another overturned fishing boat say some 200 may have drowned, a sharp rise from the 20-30 originally estimated, according to an Italian Interior Ministry source. Some 15 bodies were recovered, he said.
"It's obvious that no matter the great effort made by rescuers, when the numbers are as high as we're seeing this week, it's very risky," said Federico Fossi, a spokesman for the United Nations High Commissioner for Refugees (UNHCR) in Rome.