A 32-year-old man suspected of murdering Joanna Yeates is being questioned by detectives for a third day.
The suspect was detained in the early hours of Thursday after police investigating the 25-year-old landscape architect's death uncovered fresh evidence.
Soon afterwards, specialist search teams moved into a neighbouring flat in the building where Miss Yeates lived at 44 Canynge Road, Clifton, Bristol.
Dutch engineer Vincent Tabak, 32, is registered as living at the address with his girlfriend, Tanja Morson.
Workers have erected scaffolding and a 12ft high green tarpaulin at the rear of the substantial converted Victorian property where Miss Yeates and Mr Tabak lived.
The screen covers the entrance to Flat 2, where Mr Tabak lived, and the rear of Miss Yeates's rented home that she shared with her boyfriend, Greg Reardon, 27.
Forensic examinations were continuing yesterday in Canynge Road and at a converted terrace property about a mile away in Aberdeen Road, Cotham, where it is believed Mr Tabak was arrested in the early hours of Thursday.
Police officers have also been seen at the offices of Mr Tabak's employer, international consultancy Buro Happold, in Lower Bristol Road, Bath. The firm, and several colleagues, referred all inquiries to Avon and Somerset Police.
Mr Tabak, a trilingual engineer, is an expert in the flow of people through buildings, including sports venues. Eindhoven University of Technology confirmed he completed a PhD in "User Simulation of Space Utilisation" three or four years ago.
Neither Mr Tabak nor Miss Morson, an analyst at Dyson, in Malmesbury, Wiltshire, could be reached by telephone. It is thought the Dutchman had just returned to Britain from a holiday, having reportedly spent Christmas in Holland with his family.