TOPSHOTS A Greek police officer push back migrants who are waiting behind a fence to be registered by the police outside a police station on the island of Kos on August 10 , 2015. The number of migrants and refugees arriving on Greece's shores has exploded this year, but the Mediterranean country provides virtually no reception facilities and leaves them wallowing in "totally shameful" conditions, a UN official said on August 7. AFP PHOTO / ANGELOS TZORTZINIS