Migrants cross the border into Austria from Hungary September 5, 2015. Thousands of migrants crossed into Austria, after Hungary's surprise move to take them by bus to the border. (Photo by In Pictures Ltd./Corbis via Getty Images)
Migrants cross the border into Austria from Hungary September 5, 2015. Thousands of migrants crossed into Austria, after Hungary's surprise move to take them by bus to the border. (Photo by In Pictures Ltd./Corbis via Getty Images)