Balkan border controls have left thousands of people stranded

A police officer argues with migrants during a protest on a highway at Tempe valley near the city of Larissa, in central Greece Tougher Balkan border controls have left thousands of people stranded in Greece, where some 4,000 migrants and refugees continue to arrive daily. Police are stopping buses carrying migrants to the border with Macedonia, leaving hundreds stranded stander along the highway between Athens and the northern city of Thessaloniki.