Uzbek authorities applied to Swiss Prosecutor General for legal assistance in Gulnara Karimova's case, the office told Sputnik Friday.
Uzbekistan's Prosecutor-General's Office says Gulnara Karimova, the eldest daughter of the late longtime President Islam Karimov, is in custody following a 2015 conviction and faces additional charges in a continuing investigation, RFE/RL reports.
The Tashkent Regional Court convicted Gulnara Karimova of committing the charged crimes and she was sentenced to five years in prison, said the message.
The statement also said she was a member of an "organised criminal group" that controlled assets worth more than US$1.3 billion (RM5.6 billion) in 12 countries.
In an interview with the BBC in December, her son denied reports suggesting his mother had died, and accused the Uzbek security services of keeping her in isolation.
Karimova, 45, is the eldest daughter of the late authoritarian president of the secretive ex-Soviet Central Asian state, who died past year.More news: The Mindy Project will now address mom shaming
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It said the restriction of liberty order was imposed when she was found guilty in one case.
It was determined during the investigation that Karimova directly abetted the criminal activities of an organized group, the report said.
Karimova has additionally been charged with several other crimes, including financial misdeeds, forgery, and money laundering, and the investigation continues, the statement said.
"In the course of worldwide cooperation, investigative bodies' decisions were sent to the relevant authorities of foreign countries to seize the said assets of the organized criminal group".
Karimova is also the subject of a multi-year corruption probe targeting Western telecoms firms that United States and European investigators say paid her billions of dollars to secure access to the national market.