Fot this reason, the Alex, which on 5 July rescued a group of migrants from an inflatable raft drifting off the coast of Libya, chose to head to Lampedusa, "the only possible safe port for landing", as Mediterranea said in a tweet.
Despite Interior Matteo Salvini's apparent firmness about closing Italian ports to migrants, dozens of migrants and asylum-seekers continue to arrive in Italy by other means, some rescued by Italian authorities.
Last month Salvini's far-right League party introduced laws which would lead to heavy fines for any migrant NGOs which enter Italian waters.
An Italian rescue ship with 46 migrants on board has docked without incident in the Italian port of Lampedusa against an explicit ban after declaring a state of emergency.
There is also another ship waiting for a safe port off the coast of Lampedusa.
The rescue ship was operated by the Italian charity, "Mediterranea", and workers said conditions on board were so intolerable they had to head to port.
Humanitarian group Mediterranea Saving Humans said in a tweet late on Saturday that over 40 migrants on board were "finally allowed to disembark to receive assistance".
Mr Salvini responded angrily.
"Police forces are ready to intervene" against Alex, Salvini said in a later statement.
Meanwhile Mr Salvini was facing renewed pressure from Germany as the country's interior minister, Horst Seehofer, called for Italy to reopen its ports to rescue vessels carrying migrants.
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However, in a convoluted game of cat-and-mouse that is pitting European Union governments against each other and against the non-governmental rescue boats, Malta said it would dispatch to Italy a similar number of migrants already on its territory.
Italy has been undoubtedly one of the important predominant locations for migrants attempting to reach Europe in the course of the North Africa route, largely from Libya.
Last week, a 17-day standoff between Italy and a rescue ship ended when the German captain defied orders and forced her way to a dock in Lampedusa's main port.
Its captain, Carola Rakete, was arrested and accused of endangering the lives of police and trying to sink their boat.
A settle ordered her freed, even supposing she tranquil faces separate charges of helping folks smugglers and resisting authorities.
The Italian judge ruled in favor of Rackete, saying she was just doing her duty of saving lives and concluded that neither Libya nor Tunisia were safe countries for migrants.
"We cannot be responsible for boats with people rescued from shipwrecks onboard spending weeks on the Mediterranean because they can't find a port", Seehofer wrote.
Sea-Eye's ship Alan Kurdi is carrying migrants who were rescued when they encountered difficulties off Libya.
Earlier this week, migrants being held in a detention centre - which is the set apart many returned migrants discontinue up - had been killed in an assault which hit the constructing they had been in. Italy has impounded the Sea-Watch 3 boat whose German captain was arrested for crashing through a naval blockade a week ago before a Sicilian judge on Tuesday ruled she should be released.