Aerial pictures of the house where body parts were discovered can be seen below.
Police discovered the remains at the Barton Hill property last night:
A grandmother, who lives in Cotton Mill Lane near where forensic experts are examining two houses, has spoken of her shock at today's developments:
Becky Watts' mum Tania, grandmother Pat and brother Daniel Watts, have issued the following statement saying they are devastated by the latest developments:
Body parts have been found at a new location in the Barton Hill Area of Bristol, and now seven people are being questioned by officers.
Police announced four men and one woman all in their 20s have also been arrested - a man and a woman were already being held in police custody.
Watch the latest update from Detective Superintendent Mike Courtiour:
***NOTE the police have made a correction that they have arrested four men and one woman (not three men and two women which is said in the video)
Police have announced that body parts - believed to be Becky's - have been found at a Barton Hill property. Formal identification procedures are underway.
A further three men and two women have been arrested.
Read the police statement in full:
Last night police say they made 'a significant development' in their investigation to find Becky Watts.
Further information will be revealed at 10am.
Police are appealing for witnesses following a serious accident on the M5 this morning.
A silver Nissan, driven by a 34 year-old man, overturned at junction 9 travelling northbound at around 5.45am.
The motorway was closed between junction 11 and junction 9 northbound while the man was cut out of the vehicle by the fire service. His injuries are not thought to be life threatening.
The vehicle is being recovered and one lane is now open.
The family of missing teenager Becky Watts has made an emotional appeal after it emerged police are now treating her disappearance as suspected murder.
The 16 year-old hasn't been seen for 12 days. Avon and Somerset police are continuing to question a 21 year-old woman and a 28 year-old man on suspicion of her murder.
Despite continued searches, Becky still hasn't been found.