The stepbrother of Bristol teen Becky Watts has been charged with her murder, police say.

Nathan Matthews, 28, reported to be the 16-year-old's stepbrother, is due before Bristol Magistrates' Court on Thursday morning.

His partner Shauna Hoare, who also goes by the name Shauna Phillips, has been charged with intending to pervert the course of justice.

Becky disappeared from her home in Crown Hill, in the St George area of Bristol, on 19 February.

Body parts were found at a house in the Barton Hill area of the city, close to the home of Mr Matthews and Ms Phillips, which has also been examined by forensic experts.

However, police said formal identification procedures have not yet been completed.

On Tuesday, Avon and Somerset police revealed four other men, two aged 29 and two aged 23, and a 23-year-old woman, had been arrested on suspicion of helping an offender.

Becky's aunt, Sarah Broom, wrote on Facebook: "So today my brother got his baby girl back - 12 days of pure hell filled with heartache.

"He is completely and utterly broken and there is nothing in this world of comfort to him - how does a parent ever recover from this? How can a family?

"So with tears rolling down my face, Becky you beautiful beautiful soul, you have touched so many hearts and changed so many lives.

"You do not leave behind a legacy of anything other than pure heartfelt love and you, you beautiful girl, will live on forever in the hearts of all those that have carried you in theirs the last 12 days and of course those that carried you in your lifetime."

In a statement, Becky's family said they were "at an utter loss to understand why anyone would want to hurt our beautiful Becky in such a brutal way".

The search since Becky was reported missing on 20 February has triggered a social media campaign and has reached more than four million people.

Tributes have been left close to the site of the discovery and also at the gates of Becky's home.