SIOUX CITY, Iowa (AP) — An Iowa pork processing plant is working to address concerns the island nation of Micronesia raised about how some of its citizens working at the plant are being treated. Seaboard Triumph Foods says it follows all employment laws and it is working with its local union and officials to resolve the matter. Micronesia sent a formal letter to the U.S. State Department Friday asking U.S. officials to investigate possible misconduct at the plant, including whether false Social Security numbers are used.

Seaboard says workers are assigned a temporary tax ID number until their permanent Social Security card arrives a couple months after they start work. Seaboard officials say the Micronesians at the plant have the same rights to vacation and time off as other workers at the plant.