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The Iranian interests section in the Pakistani Embassy in Washington said it is aware of the arrest.

U.S. law enforcement officials have declined to discuss any aspect of Mr. Atarodi’s case, and records indicate the charges have been sealed.

But a Sharif University spokesman said he has been charged with buying instruments from the United States, the AP reported.

The university official spoke only on condition of anonymity because of the potential repercussions of the case.