Story highlights Nazanin Zaghari-Ratcliffe's prison term was disclosed by the Thomson Reuters Foundation

She was accused of working with organizations that Iran says were attempting to overthrow the government

Zaghari-Ratcliffe was a project coordinator with the charitable arm of the Thomson Reuters news outlet

(CNN) A British-Iranian woman has been been sentenced to five years in prison for allegedly working with organizations that Iran's Islamic Revolutionary Guard Corps claims were attempting to overthrow the government.

Nazanin Zaghari-Ratcliffe's prison term was disclosed Friday by her employer, the Thomson Reuters Foundation.

"This is a very serious condemnation that comes without any charges or evidence being made public," foundation CEO Monique Villa said in a statement.

Zaghari-Ratcliffe, who has dual citizenship, was arrested April 3. She's being held in Kerman prison in southeast Iran.

She had been visiting family in Iran with her 22-month-old daughter when she was detained at the airport in Tehran as she checked in to fly back to the UK. Her daughter was placed in the care of Zaghari-Ratcliffe's parents in Iran.

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