Jo Cox MP death: Police probe right-wing links to MP's killing

Flowers and candles have been laid in Parliament Square

Police investigating the killing of MP Jo Cox have said they are prioritising inquiries into the suspect's possible links to right-wing extremism.

The prime minister's tribute included a message which described Mrs Cox as 'a passionate MP and campaigner'

West Yorkshire Police's temporary Chief Constable Dee Collins said the force was also pursuing the suspect's link to mental health services. She said the man arrested, named locally as Mr Mair, had been examined by two specialist medical practitioners and deemed fit for detention and interview and said detectives were continuing to question him.

David Cameron and Jeremy Corbyn also signed a book of remembrance at St Peter's Church in Birstall

In a statement released by the force, it emerged a 77-year-old man who was injured during the attack, had "bravely intervened" to assist Mrs Cox. He suffered a serious injury to his abdomen and remains in hospital in a stable condition.

Mrs Cox, 41, was shot and stabbed outside her constituency surgery in West Yorkshire on Thursday. A 52-year-old man has been arrested.

The BBC understands Nazi regalia was recovered at suspect Tommy Mair's home. David Cameron and Jeremy Corbyn have described the killing as an "attack on democracy".

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The visit by the Prime Minster and Labour leader came as the Conservatives, Lib Dems and UKIP all announced they would not contest the by-election resulting from her death.

Joined by Commons Chaplain Rose Hudson-Wilkin, Leeds Central MP Hilary Benn and Commons Speaker John Bercow, the prime minister and the Labour leader bowed their heads as they laid bouquets in Birstall.