Police in Bristol investigating the murder of landscape architect Joanna Yeates have arrested the boyfriend of Tanja Morson who works at Dyson in Malmesbury.

Dutchman Vincent Tabak, 32, a neighbour of Miss Yeates, was seized by police in a pre dawn raid on Wednesday and arrested on suspicion of her murder.

Tabak and Miss Morson rented the next door flat to Miss Yeates at 44 Canynge Road, Bristol.

Miss Morson, who is a treasury analyst at Dyson, has run for the Bristol-based Westbury Harriers club and both she and Tabak have taken part in several ten-kilometre running events.

Her parents, speaking from their Cambridgeshire home, confirmed she had a relationship with with Tabak.

Geoffrey Morson said: ''We are a very close family and I speak to my daughter all the time but she has not told me anything. “I do not know if he is her boyfriend or not.

''He's a boy, she's a girl and they are friendly with each other.

''Obviously this is a murder investigation and the public have the right to know about it but I don't know any more than I have read in the newspapers.''

Miss Morson’s mother Elizabeth said she was concerned Tabak would have his name blackened like Miss Yeates’ landlord who was questioned by police in the early stages of the investigation.

She said: ''We saw what happened to the landlord and we don't want the same to happen to lovely Vincent.''