Meanwhile, a photographer from the Associated Press news agency said authorities have been collecting the bodies of people who drowned off the Libyan coast on Thursday.
Two boats, one carrying 50 passengers and another carrying around 400 people, were reported to have sunk off Libya.
A Swedish coastguard ship brought the corpses of victims and hundreds of survivors to Palermo, Sicily.
Italian police have detained ten people on suspicion of multiple homicide after 52 migrants were found dead in the hull of a boat this week.
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