Doctors Without Borders says chronic overcrowding has led to array of dire health consequences, including suicide attempts
Greece's migration minister on Tuesday pledged to improve living conditions for migrants in camps on islands in the Aegean Sea, where he said arrivals had doubled this summer.
"We will make every effort to improve the living conditions on the East Aegean islands," Migration Minister Dimitris Vitsas told Greek radio station 24/7.
He said migrant arrivals had almost doubled this summer compared to last year on the islands of Lesbos, Kos, Samos, Chios and Leros, which serve as gateways to Europe for migrants travelling from Turkish shores.
"More than 70 percent of people" living in the Moria camp on Lesbos arrived this summer, he added.
Government data on Monday showed there were more than 11,000 refugees and migrants on Lesbos, including nearly 9,000 in Moria, almost triple the nominal capacity.
Greece plans to move 2,000 asylum-seekers from the island of Lesbos to the mainland by the end of the month, a government spokesman said on Tuesday.
Human rights groups and local authorities have criticised Greece for the poor conditions at Moria, the country's biggest migrant camp.
A local governor threatened to shut it down within 30 days unless authorities clean up uncontrollable amounts of waste.
"The situation in Moria really is difficult," government spokesman Dimitris Tzanakopoulos told a briefing. "It really is borderline."
Nineteen NGOs, including Oxfam, Caritas and Terre des Hommes, earlier this month called for "immediate and urgent action" from Athens to end the "shameful" situation in Moria.
Medical charity Doctors Without Borders (MSF) on Monday said that chronic overcrowding at camps on the island on Lesbos had led to an array of dire health consequences, including suicide attempts.
MSF said its teams "are seeing multiple cases each week of teenagers who have attempted to commit suicide or self-harmed, and are responding to numerous critical incidents as a result of violence, child self-harm and lack of access to urgent medical care".
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"It is time to immediately evacuate the most vulnerable to safe accommodation in other European countries," the organisation said.
The government has moved some vulnerable families from the island camps to the mainland, but has not been able to keep up with the sheer number of fresh arrivals.
"On Sunday, 416 people arrived on the islands, including 324 on Lesbos," Vitsas said.
He added that the European Union "has not done enough to deal with the influx of migrants in the eastern Mediterranean".
Vitsas, along with Prime Minister Alexis Tsipras, will meet with European migration commissioner Dimitris Avramopoulos in Athens on Wednesday to address the situation.