HADDONFIELD, N.J. — An American seized in Yemen in a sweep of suspected al-Qaida members had been a laborer at six U.S. nuclear power plants, and authorities are investigating whether he had access to sensitive information or materials that would be useful to terrorists. Sharif Mobley, 26, worked for contractors at plants in New Jersey, Pennsylvania and Maryland from 2002 to 2008, mostly hauling materials and setting up scaffolding, plant officials said. Nuclear Regulatory Commission spokesman Neil Sheehan said Friday that investigations are under way into which areas Mobley entered. But he noted that areas containing nuclear fuel are tightly controlled, and that a laborer typically would not have access to security information or other sensitive matters. The plants are also checking areas where Mobley worked to ensure everything is in order, said NRC spokeswoman Diane Screnci. Mobley, a U.S. citizen of Somali descent, has not been linked to any wrongdoing at any of the plants. And officials said nothing he did when he worked there aroused any suspicion. Officials said Mobley passed the necessary screenings, which include criminal background checks, drug testing, psychological assessments and identity verification. Nevertheless, Edwin Lyman of the […]