Nearly 21,000 migrants arrived in Greece last week: UN

Nearly 21,000 refugees and migrants arrived in crisis-hit Greece last week -- nearly half the total number of arrivals in all of 2014 -- the United Nations said Tuesday.

"The pace of arrivals has been steadily increasing in recent weeks," UNHCR spokesman William Spindler told reporters in Geneva, bringing the number to over 160,000 since January.