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The spokesman said that the woman was the first secretary of the Swiss embassy and a Swiss citizen, and it was not clear what led to the fall.

The woman was the second-highest ranked employee at the embassy, Reuters reported, citing the semi-official ILNA news agency.

Switzerland's foreign ministry said in a statement that an employee at the Iran embassy had died, but did not identify them, Reuters reported.

"The FDFA and its head Federal Councillor Ignazio Cassis are shocked by the tragic death and express their deepest condolences to the family," it said.

News agencies reported the victim's age as either 51 or 52 years old.

Switzerland has represented US diplomatic work in Iran after the two countries cut ties after the 1979 revolution, Reuters noted.