The number of migrants and refugees arriving in Italy and Greece since the start of the year has risen sharply compared to the same period 2015 and hundreds are stranded at European borders due to rising restrictions, aid agencies said on Tuesday.

At least 102,500 people have landed on Greek islands including Samos, Kos and Lesbos this year, and 7,500 in Italy, the International Organization for Migration (IOM) said in a statement.

"We've reached that figure in two months as opposed to last year when it was reached by the summer," IOM spokesman Itayi Viriri told a news briefing.

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