Iran says held US student to be exchanged for scientist

Iran's foreign minister says a detained Princeton graduate student will be exchanged for an Iranian scientist held by the US.

Mohammed Javad Zarif made the announcement on Twitter on Saturday. The trade involves graduate student Xiyue Wang and scientist Massoud Soleimani.

"Glad that Professor Massoud Soleimani and Mr. Xiyue Wang will be joining their families shortly. Many thanks to all engaged, particularly the Swiss government," Mohammad Javad Zarif tweeted.

President Donald Trump separately acknowledged Wang was free in a statement from the White House, saying he "is returning to the United States."

"Mr. Wang had been held under the pretense of espionage since August 2016," Trump said. "We thank our Swiss partners for their assistance in negotiating Mr. Wang's release with Iran."

The Swiss Embassy in Tehran looks out for America's interests in the country as the US Embassy there has been closed since the 1979 student takeover and 444-day hostage crisis.

Iran's state-run IRNA news agency later reported that Soleimani was with Iranian officials in Switzerland.

Wang was sentenced to 10 years in prison in Iran for allegedly "infiltrating" the country and sending confidential material abroad. His family and Princeton University strongly denied the claims. Iran has detained dual Iranian nationals and those with Western ties in the past to be used as bargaining chips in negotiations.

Soleimani who works in stem cell research, hematology and regenerative medicine - was arrested by US authorities on charges he had violated trade sanctions by trying to have biological material brought to Iran. He and his lawyers maintain his innocence, saying he seized on a former student's plans to travel from the US to Iran in September 2016 as a chance to get recombinant proteins used in his research for a fraction of the price he'd pay at home.

Tensions have been high between Iran and the U.S. since President Donald Trump unilaterally withdrew America from Tehran's nuclear deal with world powers in May 2018. In the time since, the U.S. has imposed harsh sanctions on Iran's economy. There also have been a series of attacks across the Mideast that the U.S. blames on Iran.