Detectives are questioning a 32-year-old man on suspicion of murdering landscape architect Joanna Yeates.
The suspect was detained in the early hours of Thursday after police investigating the 25-year-old’s death uncovered fresh evidence.
Soon afterwards, specialist search teams moved into the neighbouring flat to 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.
Police officers were seen at the offices of his employer, international consultancy Buro Happold, in Lower Bristol Road, Bath.
The firm, and several colleagues, referred all inquiries to Avon and Somerset Police. The force has not named the suspect in custody.
Workers erected scaffolding and green tarpaulin at the rear of the substantial converted Victorian property yesterday.
The screen covers the entrance to flat two, where Mr Tabak lived, and the rear of Miss Yeates’s rented home.
Police sealed off both ends of Canynge Road as officers in white forensic outfits searched the property. Later, forensic officers loaded three wheelie bins and a mountain bike from the address in Aberdeen Road into a unmarked white transit van.
Miss Yeates’s father welcomed the latest development, which comes almost five weeks after his daughter disappeared. Speaking at the family home in Ampfield, Hants, David Yeates, 63, said he was “pleased” the police investigation was “moving forward”.