The European parliament approved the request of Bulgaria and Romania to join Europe's free travel zone, known as the Schengen agreement, last week. Bulgaria is building a 210km long fence along its border with Tukey, Greece is building a similar fence.
In the first of a special series on European border controls, Al Jazeera's Laurence Lee reports.
For more on detention in Bulgaria see the Global Detention Project.
More from the aljazeera series > Danish police search for 'outsiders'
Tuesday, 14 June 2011