A SIXTH person arrested over the murder of rookie police officer Sharon Beshenivsky has been brought to Yorkshire for questioning, police said today.

The prisoner made the 200-mile journey from the capital with armed officers last night as the husband of Mrs Beshenivsky branded her killers "cowards" and her wounded colleague Pc Teresa Milburn, who lives in Birstall, said she had lost "a dear friend".

Paul Beshenivsky said the armed raiders who gunned his wife down following a robbery in Bradford city centre had taken away "a wonderful mum", he said.

"The world is a darker place without her," he said.

Pc Milburn, 37, who joined the force on April 5 last year, was discharged from Bradford Royal Infirmary shortly after 3pm yesterday.

Last night, at her home in Birstall, where she lives with husband Chris and 16-year-old son James, she said: "Friday should have been another routine day at work; instead I lost a colleague and a dear friend.

"Sharon and I enjoyed working together immensely. Nothing can bring Sharon back and my wholehearted sympathy goes out to her family."

Police are continuing to question six people today. Four men and one woman were brought to Yorkshire yesterday morning in an armed police convoy following their arrests in London, 200 miles from the scene of the murder on Saturday.

The high-security convoy, with the force helicopter flying overhead, took the suspects to separate police stations in the West Yorkshire force area, where they are being quizzed by detectives.

Pc Beshenivsky, 38, who had three children and two stepchildren, was killed on her youngest daughter Lydia's fourth birthday as she arrived at the raid in a travel agent's shop on Morley Street on Friday.

Mr Beshenivsky, a landscape gardener, said: "It breaks my heart to think I will never hear her infectious laugh again, to think she won't be here to see our children grow.

"When Sharon left for work on Friday it was such a happy day. Our youngest daughter Lydia was celebrating her fourth birthday and she waited excitedly for her mum to come home.

"When Sharon was late I knew something was wrong.

"The people who did this to Sharon and Teresa, and to our families, are cowards.

The tragic death was marked on Saturday when Huddersfield Town met Bradford City at the Galpharm Stadium.

Players held a one-minute silence for the shot officer.

Former West Yorkshire Chief Constable Keith Hellawell said he was against arming the police.

"We must examine other ways to protect those who are prepared to risk their lives for us," he said.

"Politicians should be pressed into reconsidering the punishment meted out to those who kill police officers.

"I have long been an advocate of the return of capital punishment for this type of crime."