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AP INVESTIGATION: Nuclear black market seeks IS extremists

Over the pulsating beat at an exclusive nightclub, the arms smuggler made his pitch to a client: 2.5 million euros for enough radioactive cesium to contaminate several city blocks. It was earlier this year, and the two men were plotting their deal at an unlikely spot: the terrace of Cocos Prive, a dance club and sushi bar in Chisinau, the capital of Moldova. "You can make a dirty bomb, which would be perfect for the Islamic State," the smuggler said. "If you have a connection with them, the business will go smoothly." But the smuggler, Valentin Grossu, wasn't sure the client was for real — and he was right to worry. The client was an informant, and it took...