TEHRAN, Iran (AP) — Iran has freed a British-Australian academic who had been detained in the country for over two years in exchange for three Iranians held abroad, state TV announced.

The television report Wednesday was scant on detail, saying only that the three Iranians freed in the swap had been imprisoned for trying to bypass sanctions on Iran.

Kylie Moore-Gilbert, 33, was a Melbourne University lecturer on Middle Eastern studies when she was picked up at the Tehran airport as she tried to leave the country after attending an academic conference in 2018. She was sent to Tehran's Evin prison, convicted of spying and sentenced to 10 years behind bars. Moore-Gilbert had vehemently denied the charges and maintained her innocence.

Australian Foreign Minister Marise Payne confirmed the release Thursday, saying Moore-Gilbert would soon be reunited with her family.

“Dr. Moore-Gilbert’s release has been an absolute priority for the government since her detention,” Payne said in a statement. "The Australian government has consistently rejected the grounds on which the Iranian government arrested, detained and convicted Dr. Moore-Gilbert. We continue to do so."

Payne said the release was achieved through “diplomatic engagement” with the Iranian government and was done in consultation with Moore-Gilbert's family.

Moore-Gilbert was one of several Westerners held in Iran on widely criticized espionage charges that activists and U.N. investigators believe is a systematic effort to leverage their imprisonments for money or influence in negotiations with the West, which Tehran denies. Moore-Gilbert wrote in letters to Australian Prime Minister Scott Morrison that she had been imprisoned "to extort” the Australian government.

Moore-Gilbert's detention had strained relations between Iran and the West at a time of already escalating tensions, which reached a fever pitch earlier this year following the American killing of a top Iranian general in Baghdad and retaliatory Iranian strikes on a U.S. military base.

It was not immediately clear when Moore-Gilbert would arrive in Australia. State TV aired footage showing her clad in a gray hijab sitting at what appeared to be a greeting room at Mehrabad International Airport in Tehran.

Accompanied by another Western woman in a colorful headscarf, Moore-Gilbert wore a blue mask tucked under her chin and a stoic expression. The timing of her release was unclear, but the TV footage showed faint sunlight streaming through windows during the swap. Later, footage showed Moore-Gilbert being escorted to a large gray van after nightfall.

The state TV report did not elaborate on the Iranians it described as “economic activists” freed in exchange for Moore-Gilbert. They wore Iranian flags draped over their shoulders, black baseball caps pulled down over their eyes and surgical masks, outfits apparently designed to conceal their identities. Iran’s deputy foreign minister, Abbas Araghchi, welcomed the three Iranians at the airport.

International pressure has been building on Iran to release Moore-Gilbert. She has gone on repeated hunger strikes and her health has deteriorated during long stretches in solitary confinement. Over the summer, she was transferred to the remote Qarchak Prison, east of Tehran, as fears escalated over the spread of the coronavirus in the country's notoriously crowded prisons.

Moore-Gilbert had appealed to the Australian government to work harder for her release. In her letters to the prime minister, she wrote that she had been subjected to “grievous violations” of her rights, including psychological torture.

Payne said Moore-Gilbert and her family have asked for privacy.

“I wish Dr. Moore-Gilbert well in her recovery and her return to life in Australia,” the foreign minister said in her statement. “No doubt, as she recovers, she will draw on the same strength and determination that helped her get through her period of detention.”

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Associated Press writers Isabel DeBre in Dubai, United Arab Emirates and Nick Perry in Wellington, New Zealand, contributed to this report.