Border police use thermal vision and infrared cameras in Vitaljina, south CroatiaPhotograph: Antonio Bronic/ReutersPeople are seen through a thermal camera near the Croatia-Serbia border in NijemciPhotograph: Antonio Bronic/ReutersBorder police officers sit in a patrol car as they monitor the border between Croatia and Montenegro in Vitaljina, south Croatia. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western EuropePhotograph: ANTONIO BRONIC/Reuters
A border police officer and his dog patrol the area near the Croatia-Serbia border in NijemciPhotograph: Antonio Bronic/ReutersA border police officer patrols the Croatia-Serbia border in Tovarnik, east CroatiaPhotograph: ANTONIO BRONIC/ReutersA border police officer inspects the railway near the Croatia-Serbia border in Tovarnik, east CroatiaPhotograph: Antonio Bronic/ReutersA border police officer inspects an old house near the Croatia-Serbia border in NijemciPhotograph: Antonio Bronic/ReutersBorder police officers patrol the Croatia-Serbia border in NijemciPhotograph: Antonio Bronic/ReutersA border police officer inspects a bus with a narcotics dog at the border crossing in Bajakovo, on the Croatia-Serbia borderPhotograph: Antonio Bronic/ReutersA border police officer inspects documents at the border crossing in Bajakovo, on the Croatia-Serbia border, east CroatiaPhotograph: Antonio Bronic/ReutersDocuments under ultra violet light at the border crossing in Bajakovo, on the Croatia-Serbia borderPhotograph: Antonio Bronic/ReutersCroatian police officers prepare to raise the EU flag for the first time at the Bajakovo border crossing between Serbia and Croatia, early 1 July 2013Photograph: Marko Djurica/Reuters
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