US says Cuba frees some `political prisoners`
"They have already released some of the prisoners, we would like to see this completed in the near future," spokeswoman Jen Psaki told reporters, saying she would not provide a specific number.
On Monday, Psaki had said she was unable to say whether any of the 53 had yet been freed.
Last month US President Barack Obama signalled a historic shift in US ties with Cuba, ordering his administration to initiate steps to normalise relations.
The State Department must also study the prospects of lifting communist-run Cuba from the list of states that sponsor terrorism.
Obama also wants to eventually gain cooperation from Congress in lifting the 54-year-old US trade embargo on Cuba which he has described as "self-defeating."
Senior officials from both countries are due to meet to start the process of normalising ties in Havana later in January. An exact date has not been set.