Nazanin Zaghari-Ratcliffe, a British-Iranian dual national who has been detained in Iran for nearly six years, has left Tehran's airport after being freed with another fellow detainee, Anoosheh Ashoori, British officials said.
British Prime Minister Boris Johnson, on a trip to the United Arab Emirates and Saudi Arabia, tweeted that he was pleased that the two's "unfair detention" had ended.
"The UK has worked intensively to secure their release and I am delighted they will be reunited with their families and loved ones," he wrote. He said the two would return to the UK.
An Oman Royal Air Force jet left Iran just moments before lawmaker Tulip Siddiq, who represents Zaghari Ratcliffe, tweeted that they were in the air.