Russia's Federal Penitentiary Service confirmed the transfer and said Tolokonnikova's family would be notified within 10 days of her arrival per regulations.

More from GlobalPost: In-depth series: Pussy Riot found guilty

But those 10 days are up, and Tolokonnikova's husband said they still don't know where she is.

Tolokonnikova, 24, was on a hunger strike at a prison in Moldovia and had been hospitalized.