From the article this was all confined within the Muslim community.
Western authorities tend to stay out of internal Muslim community matters. Both because Muslims are reluctant to come forward ( both based on culture and due to threats/coercion as documented in the article) and because there’s extreme political pressure (see George Galloway) to stay out.
The children were nearly all white, English ethnicity girls, usually from broken or dysfunctional families, who were groomed by Muslims before being raped, abused and forced into prostitution.
These were deliberate acts of degradation and insidious warfare against non-Muslims.