The Met Police has announced via Twitter today that it has made three arrests a 17 year old boy, a 21 year old man and and 18 year old man. 

The BBC say:

‘A boy, 17, and a 21-year-old man were arrested by police in Camden. Earlier a man, 18, was arrested after going to a police station. All three remain in custody.’

So it appears that someone handed themselves in.

ttps://twitter.com/metpoliceuk/status/573007781344776192

More as we hear it.