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Border police officers sit in a patrol car as they monitor the border between Croatia and Montenegro in Vitaljina, south Croatia, April 29, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken April 29, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

Border police officers inspect the border with thermal and infrared cameras in Vitaljina, south Croatia, April 29, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken April 29, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A new border crossing between Bosnia and Herzegovina, and Croatia is seen in the distance, behind the old border crossing, in Neum, south Croatia, April 30, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken April 30, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A Bosnian border police officer (L) and a Croatian border police officer are seen at the new border crossing with Bosnia and Herzegovina in Neum, south Croatia, April 30, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken April 30, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A border crossing is seen at Bregana July 1, 2013. Croatia became the European Union's 28th member on Monday and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatian and Slovenian border police now work together. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

Croatian, Slovenian and European Union flags are seen at a border crossing in Bregana July 1, 2013. Croatia became the European Union's 28th member on Monday and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatian and Slovenian border police now work together. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A Slovenian border police officer inspects documents at a border crossing in Bregana July 1, 2013. Croatia became the European Union's 28th member on Monday and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatian and Slovenian border police now work together. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A border police officer and his dog patrol the area near the Croatia-Serbia border in Nijemci, east Croatia, June 5, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken June 05, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A Croatian border police officer inspects the railway near the Croatia-Serbia border in Tovarnik, east Croatia, May 12, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken May 12, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A border police officer inspects a bus at the border crossing in Bajakovo, on the Croatia-Serbia border, east Croatia, May 12, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken May 12, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A border police officer inspects a bus with a narcotics dog at the border crossing in Bajakovo, on the Croatia-Serbia border, east Croatia, May 11, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken May 11, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A border police officer watches as a narcotics dog sniffs a suitcase at the border crossing in Bajakovo, on the Croatia-Serbia border, east Croatia, May 12, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken May 12, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A border police officer inspects documents at the border crossing in Bajakovo, on the Croatia-Serbia border, east Croatia, May 11, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken May 11, 2013. REUTERS/Antonio Bronic ATTENTION EDITORS: PICTURE 12 OF 23 FOR PACKAGE 'TIGHTENING CROATIA'S BORDERS'. SEARCH 'EXTERNAL FRONTIER' FOR ALL PICTURES ( CROATIA-BORDERS/ )

Documents are seen under ultra violet light at the border crossing in Bajakovo, on the Croatia-Serbia border, east Croatia, May 11, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken May 11, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

Croatian border police officers drive a patrol car near the Croatia-Serbia border in Lipovac, east Croatia, May 11, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken May 11, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A border police officer inspects an old house near the Croatia-Serbia border in Nijemci, east Croatia, June 5, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken June 5, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A border police officer patrols the Croatia-Serbia border in Tovarnik, east Croatia, May 12, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken May 12, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A border police officer and his dog search a field near the Croatia-Serbia border in Nijemci, east Croatia, June 5, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken June 5, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A border police officer monitors the Croatia-Serbia border in Nijemci, east Croatia, June 5, 2013. Croatia became the European Union's 28th member on July 1 and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatia lies on the notorious Balkan smuggling route, used for transporting illegal migrants and drugs from the Middle East and Africa into western Europe, and its border police have modernized their equipment to include thermal vision cameras and infrared binoculars to improve control. Picture taken June 05, 2013. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

Croatian border police officers patrol along the border between Croatia and Montenegro, close to the Croatian village of Karasovici on June 5, 2013. Croatian border is expected to become the most Southern border of the EU after the country joins the bloc on July 1, 2013. Croatia is gearing up to lavishly celebrate joining the European Union on July 1, but economic worries are overshadowing the festivities planned to mark the successful end of the Balkan country's 10-year bid for membership. ELVIS BARUKCIC/AFP/Getty Images ( 520865650 )

Cars pass through a closed Croatian border crossing in Bregana July 1, 2013. Croatia became the European Union's 28th member on Monday and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatian and Slovenian border police now work together. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )

A croatian border police officer looks at screen while using advanced equipment for video surveillance of the critical points along the border between Croatia and Bosnia, near the Croatian town of Metkovic, on June 5, 2013. Croatian border is expected to become the most Southern border of the EU after the country joins the bloc on July 1, 2013. Croatia is gearing up to lavishly celebrate joining the European Union on July 1, but economic worries are overshadowing the festivities planned to mark the successful end of the Balkan country's 10-year bid for membership. ELVIS BARUKCIC/AFP/Getty Images ( 520866019 )

A closed Croatian border crossing is seen at Bregana July 1, 2013. Croatia became the European Union's 28th member on Monday and its roughly 1,400 km of land border with non-EU neighbors Bosnia, Serbia and Montenegro will now become the bloc's new external frontier. Croatian and Slovenian border police now work together. REUTERS/Antonio Bronic ( CROATIA-BORDERS/ )