Over several months, the new owners held construction works on the site, with English-speaking guards shooing away curious neighbors. A whole “building within a building” was constructed in the former riding area, ABC reports. It had concrete walled cells to house prisoners and separate cells for interrogations.

The secret prison also had a large garage, while the stables were converted to guard and personnel accommodation. The facility had autonomous electricity supply with American standard 110 volts outlets, as opposed to European 220 volts.

A former CIA official said as many as eight suspects were kept in the Lithuanian secret prison for more than a year. It was closed in 2005, after public disclosure of the “black sites” program.

After the initial report on the suspected secret prison in the country, Lithuanian foreign ministry officials denied its existence. However the parliament launched an investigation into the allegations. The report on it is expected in mid December.