I looked up the BBC story. They reported what the mother told them. They contacted ACS, but were told the Agency couldn't comment.
The BBC article reported the mother's story but made no judgement.
I watch the BBC News daily and remember no story- it was probably only carried locally in the UK service.
The BBC news, along with the NY Times and Washington Post, are the most reliable sources of the news available.
The whole thing is a tempest in a teapot, exacerbated by complete unfamiliarity with the procedures set up by the NY police services and the ACS.
The girls were examined medically and given uniforms. This is not 'strip-search.' They were asked questions that would typically be asked in a large city, but probably foreign to small town UK youth. From what I know of cities like Glasgow and Manchester, treatment probably would be similar.