Around 200 refugees and migrants have amassed at Serbia's border with Hungary asking to be let through as they seek entry into more prosperous Western European countries.
But Hungary's Prime Minister Viktor Orban ordered a fence to be put up five years ago, saying they were not welcome.
Thousands of people live in refugee camps in the Balkans, many of whom are from war-torn countries.
Al Jazeera's Laura Burdon-Manley reports.
