1.   Dozens of unexplained helicopter flights across the border have provoked suspicions.

2.   Dozens of unexplained helicopter flights across the border have raised Western suspicions.

3.   Dozens of unexplained helicopter flights between Serb-led Yugoslavia and Bosnian Serb territory raised Western suspicions.

4.   Dozens of unexplained helicopter flights between Serb-led Yugoslavia and Bosnian Serb territory first raised Western suspicions of smuggling.

5.   Unexplained black helicopters.