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Speaking to BBC News, Labour MP Barry Sheerman says Jo Cox was a "brilliant" MP, and says he'd regarded her "almost as a political daughter".

She was "one of the brightest and best," he adds.

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Ed Miliband also told the World at One that "the vast majority" of politicians "are in it for the right reasons".

The former Labour leader said there was "a danger that it doesn't take long for the caravan to move on and for people to go back to their old ways" but that he hoped people reflected on the tone of politics.

"It isn't about taking the passion out of politics" he insisted, adding: "Yesterday it was this moment where you thought gosh, a lot the way we conduct ourselves looks so small in comparison to this terrible event."

He suggested that security around MPs and their staff should be looked at "but I want us to hold on to the accessibility of our democracy".

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Speaking earlier to the World at One, former Labour leader Ed Miliband echoed the words of current leader Jeremy Corbyn and one of his predecessors, Neil Kinnock, when he said of Jo Cox's death: "We've lost a member of our family."

Mr Miliband said Jo Cox had "this extraordinary combination of passion for the causes she believed in" and a willingness to campaign across party lines. She also had "gentleness and warmth", he adds.

"We should reflect on Jo's life and what she taught us rather than the manner of her death," he tells the World at One. "And I think we should also reflect on the way we conduct our politics."

"Everybody is united in grief, in horror and in an overpowering respect," says the Speaker of the House of Commons, John Bercow.

He describes the killing of Jo Cox as "a despicable and appalling act".

The killing of Jo Cox was "an act of hatred" in the town she loved and grew up in, Labour leader Jeremy Corbyn has said.

Paying tribute to his colleague, he said her killing was "an attack on democracy", which left behind her husband and two children "who will never see their mother again".

MPs will get a chance to pay their own tributes on Monday after David Cameron agreed to the recall of Parliament, he said.

Speaking in Birstall, Mr Corbyn hailed her work for anti-slavery campaigns, Oxfam, human rights and justice, and said:

Mr Corbyn said Mrs Cox's husband, Brendan, "made a truly wonderful statement, that in her memory we'll try to conquer hatred with love and respect".

Hailing Jo Cox as one of Parliament's "most passionate and brilliant campaigners", David Cameron said the nation "is rightly shocked" at her death.

The prime minister met Mrs Cox in Darfur in 2006 when she was working to save "the lives of vulnerable refugees".

Jo Cox died "doing her job" and her values of service, community and tolerance should be redoubled, David Cameron has said in her Batley and Spen constituency.

The prime minister, paying tribute to the 41-year-old married mother of two, said politics is about public service and MPs wanted to do things for other people to make the world a better place.

While politicians disagree, he said everyone "should value and see as precious the democracy we have on these islands".

Jeremy Corbyn says the prime minister has accepted his request to recall Parliament on Monday.

They were joined by shadow foreign secretary Hilary Benn and Commons Speaker John Bercow

Commenting on the killing of Labour MP Jo Cox, German Chancellor Angela Merkel said British political parties needed to moderate their speech in their campaigns on the EU referendum:

Labour MP Neil Coyle says parliamentarians have been warned of the risk of copy-cat attacks after the killing of Jo Cox.

Mr Coyle, who was a friend of Mrs Cox, said MPs had received new security advice - and he feared some may choose to step down because of the abuse they face.

But Mr Coyle said "There are instances where the police can do more". "There are MPs who have been asking for extra support from the police and who are not getting it," he said.

Women MPs faced more abuse than men - and when he and Mrs Cox penned a joint newspaper article, people phoned her office to "attack her down the phone", but he did not receive the same treatment, he said. 

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Former Labour leader Ed Miliband has remembered the "incredible gentleness and warmth" of Jo Cox, the MP killed in a violent attack outside her constituency surgery on Thursday.

He told the BBC's World at One she had an "extraordinary combination of passion for the causes she believed in and a willingness to fight for those across party lines .. as an aid worker at Oxfam".

He said it was time to look at "the way we conduct our politics", saying: "There's too much hate and not enough respect - that's true of all sides." 

But he said his thoughts were with Mrs Cox's husband and two young children: "That's what makes this so unbearable."

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Politicians like Jo Cox deserved "to be cherished", Baroness Kinnock has said, adding: "I loved her".

Mrs Cox worked for Glenys Kinnock when she was an MEP and shared her interest in international development. Her former boss said she was "highly intelligent, jolly, brave and worked hard."

Speaking more generally about politicians, Baroness Kinnock told BBC's World At One programme:

The Conservatives have been explaining their decision not to put up a challenger for Jo Cox's seat. 

A spokesman said: "Following the tragic killing of Labour MP Jo Cox, the Conservative Party has decided not to contest the forthcoming by-election as a mark of respect to a much-loved and respected politician.”