An Italian prosecutor said last month that charity boats were colluding with traffickers off Libya, in what EU border agency Frontex described as tantamount to providing a "taxi" service to Europe.
But UN High Commissioner for Refugees Filippo Grandi paid tribute to the role of non-governmental organisations (NGOs), in comments about Mediterranean crossings over the weekend.
"The tireless efforts of the Italian Coast Guard, in coordination with Frontex .. And of NGOs are truly remarkable," he said in a statement.
Some 6,000 migrants were rescued over Friday and yesterday in the Mediterranean in some 40 operations coordinated from Rome by Italian coastguards, as well as by several NGOs.
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But these groups, in particular SOS Mediterranee and Medecins sans Frontieres (MSF), have been for some days the target of criticism from prosecutors and politicians in Italy.
NGOs have all dismissed suggestions of de facto collusion with smugglers as a baseless slur on volunteer crews whose only mission is to save lives in the absence of EU governments acting effectively to do so.
With most departures coming in the warm summer months, the trend points to around 250,000 people arriving over the course of 2017. Some 500,000 migrants were registered in Italy in the three years spanning 2014-16.
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