- 26 - that persons detained under the Aliens legislation be strictly separated from criminal suspects; - that an information leaflet be given to persons detained under the Aliens legislation explaining the procedure applicable to them and their related rights; this leaflet to be available in the languages most commonly spoken by such persons and, if necessary, the services of an interpreter provided. 60. The delegation was informed that a certain number of cells also existed on the 11th and 12th floors of Athens Police Headquarters, but that they were no longer used to accommodate detained persons. The delegation visited the cells on the 11th floor and found that they measured approximately 3.5m². The CPT would stress that cells of such a size are not suitable for the detention of someone obliged to stay in custody overnight; at the very most they might, if necessary, be used for temporary holding purposes (i.e. detention for a maximum of a few hours), and this subject to the strict condition they are equipped with adequate lighting and ventilation as well as a means of rest. 61. The delegation also visited a small juvenile detention area on the 3rd floor of Athens Police Headquarters. The conditions of detention in that area were quite acceptable. 62. In addition to the Police Headquarters, the delegation visited three police stations in the Athens area: Police Station No. 4 in Socratous St., Piraeus Central Police Station and Glyfada Police Station. No one was in custody at the time of the delegation's visit to Police Station No. 4. The station's detention facilities consisted of two good-sized multi-occupancy cells. They were clean and well-lit and seemed to have adequate ventilation. The cells were equipped with a bench fitted to the wall, and contained blankets; however, it appeared that no mattresses were available for persons obliged to stay in custody overnight. At Piraeus Central Police Station, nine persons were in custody at the time of the delegation's visit. Seven persons were being held in a cell measuring approximately 13 m², some of whom had been in custody for a number of days; given its dimensions, no more than four persons should be kept in the cell overnight. The other two detainees were being held in a cell measuring 10+m². Lighting and ventilation in the cells were adequate. Wooden beds were provided as a means of rest, and the detainees had been given blankets; however, once again, no mattresses were available. It should be added that the toilet/washing facilities for detainees were in an appalling condition. Conditions of detention in the one cell at Glyfada Police Station left a great deal to be desired. The cell was small (approximately 5 m²), devoid of any form of light, and had no effective means of ventilation. It contained two concrete blocks equipped with mattresses and blankets, which were very dirty. Police officers present stated that no more than two persons would ever be kept in the cell overnight. However, consultation of the custody register showed that on several occasions in the recent past, more than two persons (on one occasion six persons) had spent 24 hours or more in custody at the station; it was advanced that the additional persons had been allowed to sleep in one of the station's offices. This cell should be taken out of service until such time as it is provided with adequate lighting and ventilation and should not accommodate more than one person overnight. It might be added that there was ample space within the police station for the construction of better detention facilities.