Gary Berntsen, who led a CIA paramilitary unit pursuing bin Laden shortly after the September 11, 2001 attacks, said Pakistan is a country bin Laden knows well.

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The Zemun gang, in which Milisavljevic was allegedly a senior member, was born out of Arkan's Tigers, a Serbian paramilitary unit which gained a reputation for brutality during the conflict in the former Yugoslavia in the 1990s.

BBC: Spain to extradite convicted killer of Serb PM Djindjic