This month, hundreds of migrants and refugees have reached Greek islands near Turkey by boat, increasing the pressure on struggling reception centres. The camps on those islands already have nearly 42,000 asylum seekers, though they were designed for about 6,000.
Aid agency Medecins Sans Frontieres (MSF), which is working on the islands, says more than 14,000 of the migrants are children.
“Men, women and children are living in horrific conditions in these overcrowded centres, in constant fear and with very basic access to services like toilets, showers, electricity,” Stephan Oberreit, MSF head of mission in Greece, told the BBC.