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In this image made from video provided by the Moldova General Police Inspectorate, an investigator looks at a vial destined for the Islamic State containing cesium-135 on the driver’s seat of Valentin Grossu’s car following his arrest in Chisinau, Moldova, February 19, 2015 (Credit: Moldova Police via AP)

In this image made from video provided by the Moldova General Police Inspectorate, an investigator looks at a vial destined for the Islamic State containing cesium-135 on the driver's seat of Valentin Grossu's car following his arrest in Chisinau, Moldova, February 19, 2015 (Credit: Moldova Police via AP)