Thousands of migrants, newly arrived in Greece from Turkey during the weekend, crowded the Athens port of Piraeus Monday, even as the Balkan countries they must traverse to reach wealthier parts of Europe pushed their gates further shut, dpa reported. More than 4,000 people were ferried to Athens from Aegean islands on Monday. Most are looking to continue their journey across Serbia, Croatia, Slovenia and then Austria, with Germany their final goal. The Greek minister in charge of migrants, Ioannis Mouzalas, told state TV late Sunday that more than 5,000 people were stuck at the border with Macedonia without a clue as to whether or when they may be allowed to continue.