A federal judge unsealed the case after the prosecutor, Assistant US Attorney Todd Hinkley, signed a plea agreement for one of three men charged in 2012.
The men are accused of illegally shipping goods to Syria through other countries for nine years by creating false invoices that mislabelled the items, undervalued them and listed false purchasers and end users.
A 2003 federal law paved the way to broad new economic and trade sanctions against Syria, amid accusations by lawmakers that it had been a detriment to the fight against terrorism in the Middle East and Iraq. The sanctions, imposed in 2004, banned all US exports to Syria except food and medicine.
"We know they were exported to Syria," Hinkley said. "The end user information we were not able to, at least to this point, to develop in the investigation."
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Prosecutors say the items included portable instruments used to detect, measure and classify chemical agents; masks used in civil defence against chemical agents; laboratory equipment; industrial engines used in oil and gas fields; and a device used to locate buried pipelines.
Harold Rinko of Pennsylvania, Ahmad Feras Diri of London and Moawea Deri, a Syrian citizen who the federal government says is at large are charged. Diri and Deri refer to themselves as brothers in communication cited in the indictment. They allegedly used Rinko as a "front" to purchase the items and ship them to a country without an export ban.
An agreement signed by Rinko to plead guilty to a conspiracy count was also unsealed today. In a brief telephone interview, Rinko confirmed to The Associated Press that he has agreed to plead guilty.