An American graduate student held in Iran will be released in exchange for an Iranian scientist held by the U.S., officials confirmed.

Iran’s foreign minister and the White House both announced that Princeton University graduate student Xiyue Wang will be exchanged for scientist Massoud Soleimani.

“After more than three years of being held prisoner in Iran, Xiyue Wang is returning to the United States,” President Trump said in a statement released by the White House on Saturday. “The highest priority of the United States is the safety and well-being of its citizens. Freeing Americans held captive is of vital importance to my Administration, and we will continue to work hard to bring home all our citizens wrongfully held captive overseas.”

Wang’s release was negotiated with the assistance of the Swiss Embassy in Tehran, who looks out for America’s interests in the country as the U.S. Embassy there has been closed since the 1979 student takeover and 444-day hostage crisis.

This is a developing story. Check back for updates