There has been a major drop in refugees arriving in Greece in the last 24 hours

Only 18 refugees and migrants have entered Greece by sea over the past 24 hours, a week after a European Union deal to deport new arrivals back to Turkey came into effect.

However, more than 53,000 remained stranded in Greece, through which more than a million people from the Middle East and Africa have passed since the beginning of 2015 - heading to more prosperous European countries.