By Karolina Tagaris and Lefteris Papadimas ATHENS (Reuters) - Stone-throwing migrants in a Greek detention camp clashed with police on Tuesday hours after two ferries shipped refugees back to Turkey under a disputed deal intended to stem the human influx into Europe. Garbage bins were set on fire, a police spokesman said, and migrants "were throwing stones and pieces of metal at police". Just over 340 people have so far been returned to Turkey since April 4 under the accord agreed with the European Union in March after more than 1 million people fleeing war and poverty in the Middle East and beyond reached the continent last year.
