Nigel Farage has laid flowers at an informal memorial to Jo Cox in Parliament Square.

Sheltering against the rain under an umbrella, the UKIP leader bowed his head for a moment after he placed his bouquet of purple and yellow blooms at the site across the road from the House of Commons.

He left a note saying: "A terrible waste of a life. Sincere condolences to all the family."

Police forces are contacting MPs around the country to give security advice following the death of Labour MP Jo Cox, the National Police Chiefs' Council said. 

Image source, PA

Here's a photo of Jo Cox, David Cameron and former International Development Secretary Andrew Mitchell in Sudan's western region of Darfur.

The prime minister said he first met Mrs Cox here in 2006 "doing what she was brilliant at - she was looking after and saving the lives of vulnerable refugees".

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"I think we have to be careful not to prejudge the motive for this attack," says Labour former minister Ben Bradshaw.

However, he asks people to think "about the political culture that we have in this country and how we nurture a kinder culture".

On the subject of MPs' safety, he says: "I think we're all aware of our vulnerability." He adds that he was attacked physically during the debate on hunting a few years ago.

He suggests that "appointment-only surgeries" are a good security precaution, but rejects any notion that MPs "drive around in armoured convoys", claiming: "That's what happens in dictatorships."

The Vote Leave campaign has issued the following statement:

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During a normal session in the Commons, MPs from the governing party sit on one side of the House, with opposition parties facing them on the other.

However, says BBC political correspondent Eleanor Garnier, there is speculation that MPs might not sit according to party loyalties when the Commons is recalled on Monday.

The idea, Eleanor says, would be "to actually have MPs mixed up to really show the unity that we saw earlier with David Cameron and Jeremy Corbyn".

Image source, Oxfam

Long before she became an elected politician, Jo Cox had built a successful career fighting human suffering in the charity sector.

Eight years working for Oxfam - where she met her husband - enabled her to show inspiring leadership and political intelligence, despite her remarkably young age, her former colleagues recall.

Oxfam's Max Lawson described her campaigning to end the conflict in Darfur as "particularly brilliant" and added: "She was as a ball of energy, always smiling, full of new ideas, of idealism, of passion."

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On the issue of MPs' security, Lindsay Hoyle, who chairs the parliamentary security committee, says it'll be meeting on Tuesday to go through yesterday's incident "thoroughly".

He tells the BBC News channel: "What we can't do is have a knee jerk reaction. We've got to make sure MPs take up the security packages already available, and do we need to enhance them, what do we need to do?"

But Mr Hoyle says MPs have got to be able to get on with their job and adds: "There's a balance to be struck".

He also says it's not a question of a "one size fits all" approach, saying each MP will want to ensure they have the appropriate protection for them, their staff and their family.

The Speaker’s office has confirmed that Parliament will sit at 14.30 BST - as is usual for a Monday.

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Baroness Kinnock has said she hopes people will realise that politicians like Jo Cox "deserve to be cherished".

Glenys Kinnock told presenter Mark Mardell it was important to recognise the good work that many politicians did.

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Britain Stronger in Europe have confirmed they are suspending national campaigning tomorrow as a mark of respect for Jo Cox.

Will Straw, the Remain group's executive director, said in a statement: "The campaign will continue to suspend all its planned national campaign events, street stalls, and rallies tomorrow as a mark of respect for the tragic murder of Jo Cox."

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Commons deputy speaker Lindsay Hoyle says the recall of Parliament on Monday to pay tribute to Jo Cox "is the right thing".

"It's about bringing MPs together and it's about MPs paying their tribute," he says. "It's about coming to terms with the shock and horror."

Mr Hoyle, who is a Labour MP, says that Jo Cox's death is a loss not only to the "Labour family" but to "the political family that goes across all parties".