I Wonder How They Managed To Arrest Someone So Quickly?

[cassa333]

https://www.bbc.co.uk/news/uk-england-hampshire-44999537

[Buenchico]

We need to be careful when discussing a matter where the sub judice rules apply but as an example of how someone might be quickly tracked down in such a situation, I'd point out that it's possible that someone who 'engages in sexual activity with a child' might leave traces of semen.

If that person is already known to the police (even if was for a completely unrelated offence, such as shoplifting or drink driving) they'd have his DNA profile on file.

[THECORBYLOON]

Any speculation about the suspect which could lead to his identification will end up being deleted.

[Canary42]

DNA or finger prints on record.

[jno]

there might even have been an eyewitness, or maybe the arrested man told somebody, who knows? There are many sorts of evidence that might be involved.

[Gromit]

I think it is more likely that the victim’s phone and messaging /social media data would reveal who she was meeting that day.
Unfortunatelly, this kind of crime is seldom a random attack, and far more likely simeone the victim knows.

[andy-hughes]

We will find out in due course, but it is standard for the police to know far more about crimes they are investigating than the details they release to the media.

[douglas9401]

They checked on the local fiends and wierdos and got lucky with some evidence.

[anotheoldgit]

The alleged killer is Stephen Nicholson, 24, a carer who was recently living with Lucy, 13, and her mother in Southampton.

http://www.dailymail.co.uk/news/article-6005171/Police-release-pictures-clothes-worn-girl-13-killed-dumped-woods.html

[Gromit]

// likely simeone the victim knows //