WASHINGTON (AP) — The U.S. government has called for North Korea to release an American citizen detained there.

State Department spokesman Mark Toner said Tuesday that Swedish officials had visited the American because the U.S. does not have diplomatic relations with Pyongyang. Toner gave no details about the arrest, when it happened, and the identity of the individual, saying the person had not signed a privacy waiver.

He urged North Korea to treat the citizen “in a manner consistent with international human rights law.”

Several Americans have been arrested in North Korea in recent years.

In August, former President Jimmy Carter brought home a U.S. citizen, a man named Aijalon Gomes, who had been detained in the communist country for seven months.