CAT/C/CHN/CO/4 page 12 28. The Committee notes the State party’s efforts to ensure that female prisoners are supervised by female officers. However, the Committee is concerned about reported incidents of violence against women in detention centres, including against Tibetan nuns in detention, and regrets the lack of information on the number of complaints and the measures taken to prevent torture and ill-treatment of women in places of detention (arts. 12, 13 and 16). The State party should ensure that procedures are in place to monitor the behaviour of law enforcement officials. The State party should promptly and impartially investigate all allegations of torture and ill-treatment, including sexual violence, with a view to prosecuting those responsible, and providing redress and compensation to the victims. Use of violence in the implementation of the population policy 29. The Committee notes again with concern the lack of investigation into the alleged use of coercive and violent measures to implement the population policy (A/55/44, para.122). While taking note of the information provided by the delegation of the State party that local officials in Lingyi City have been held accountable for using such coercive and violent measures, the Committee is concerned about the inadequacy of the sanctions actually taken against these and other officials who have engaged in similar conduct. It is equally concerned by the fact that human rights defenders, such as Chen Guangcheng, who have provided legal advice to victims and publicly denounced the use of coercive and violent measures to implement the population policy, have been harassed by the authorities, as have his lawyers (arts. 12 and 16). The State party should implement the population policy in full compliance with the relevant provisions of the Convention and prosecute those responsible for resorting to coercive and violent measures in implementing such policy, in particular against women belonging to ethnic minority groups. Compensation and rehabilitation 30. While noting the information provided about victims’ rights to compensation envisaged in the Law on State Compensation, the Committee notes with concern the extremely small numbers of cases in which individuals have received such compensation. The Committee expresses its concern about the limited measures for the rehabilitation of victims of torture, including sexual violence, trafficking, domestic violence and ill-treatment (art. 14). The State party should ensure that adequate compensation is provided to victims of torture and ill-treatment and that appropriate rehabilitation programmes are provided to all victims of torture, including sexual violence, trafficking, domestic violence and ill-treatment, including medical and psychological assistance. Impunity and appropriate penalties for acts of torture 31. The Committee is deeply concerned that allegations of torture and/or ill-treatment committed by law enforcement personnel are seldom investigated and prosecuted. The Committee notes with great concern that some instances of torture involving acts which are