MICHEL MARTIN, HOST: The World Cup begins Thursday, and public safety officials are scrambling to get ready. The event is bigger than the last time the U.S. played host in 1994. And the international scene is tense. NPR's law enforcement correspondent Martin Kaste has been talking to experts about the risks they see. MARTIN KASTE, BYLINE: When people think about security at international soccer tournaments, they often think about scenes like this one in Miami in 2024.