A/HRC/7/4 page 3 The Working Group recommends that the Human Rights Council carry out an in depth urgent deliberation on illegal immigrants and asylum-seekers in detention around the world, in view of their specific vulnerability. To that effect, the Working Group recommends the organization of a seminar with the participation of all stakeholders. It also recommends that States use detention of these persons only as a last resort. Concerning vulnerable groups in detention susceptible to sexual abuse, the Working Group recommends that States ensure that juveniles are held separately from adults and women separately from men. Detention facility staff should be appropriately trained to ensure that sexual abuses in detention do not occur. There should be no impunity for perpetrators of sexual abuse and victims of such abuse should enjoy access to an effective complaints procedure. The report also includes recommendations regarding measures to be adopted in the context of counter-terrorism and in states of emergency, as well as for registration books at detention facilities.