Detectives were yesterday granted a further extension to continue questioning a 32-year-old man who was arrested on suspicion of the murder of landscape architect Joanna Yeates.
The suspect was detained in the early hours of yesterday after police investigating the 25-year-old's death uncovered fresh evidence.
Soon afterwards, specialist search teams moved into a neighbouring flat in the building where Miss Yeates lived in Clifton, Bristol.
Dutch engineer Vincent Tabak (32) is registered as living at the address with his girlfriend Tanja Morson.
A police spokesman said: "This afternoon, police have been to court and successfully applied for a warrant of further detention, which will enable us to continue to question the 32-year-old man we arrested yesterday until late tomorrow evening.
"As soon as we are in a position to release any further information, we will update the website and voicebank immediately.
Police officers were seen at the offices of Mr Tabak's employer, international consultancy Buro Happold, in Bath.
The firm, and several colleagues, referred all inquiries to police. The police have not named the suspect in custody.
Mr Tabak lived in Flat 1, which shares the ground floor of 44 Canynge Road with Flat 2, Ms Yeates's home.
A floor plan reveals that the two flats were connected by an interior door between two bedrooms which has since been blocked.
Mr Tabak, a trilingual engineer, is an expert in the flow of people through buildings, including sports venues.