Hungary says its immigration problem has reached unprecedented levels, reporting more than 100,000 migrants entering the country so far this year.
A four-metre high fence is being built along its border with Serbia, in an attempt to keep migrants away.
The journey to the Serbia-Hungary border usually starts after migrants arrive in Greece, often from Africa or the Middle East. The migrants then move into Albania, Serbia and from there into Slovenia and Hungary.
The construction of the fence in Hungary is aiming to make the last part nearly impossible to achieve.
Al Jazeera's Laurence Lee reports from the Serbia-Hungary border.
Source: Al Jazeera