Britain's Prime Minister David Cameron led tearful tributes Monday to slain lawmaker Jo Cox, whose brutal murder has opened up fresh splits in the campaign for Britain to leave the EU in a referendum this week.
The killing last week sparked accusations of hate-mongering in an already heated battle for votes before a momentous ballot on Thursday that could determine the political and economic fate of Europe.
Financial markets rallied as prospects for the "Remain" side appeared to brighten in the latest surveys, putting it neck-and-neck with the "Leave" side. London's FTSE stock market index surged more than three percent and sterling made strong gains.
Meanwhile divisions have surfaced among pro-Brexit campaigners after UK Independence Party leader Nigel Farage released a poster last Thursday showing immigrants trudging through Europe with a headline in red screaming "Breaking Point".
On that same day, Cox, a 41-year-old mother of two and pro-EU, was on her way to meet members of the public in northern England when an attacker shot and stabbed her, leaving her bleeding on the pavement. She died of her wounds.
- Wiped away tears -
To cries of "hear, hear" in parliament, Cameron called on fellow politicians to remember the Labour Party lawmaker by "uniting against the hatred that killed her, today, and for ever more".
Cox's husband Brendan and her children, aged three and five, listened in parliament's gallery as politicians, sporting white roses in memory of her home county of Yorkshire, paid tribute.
Some lawmakers clutched handkerchiefs and wiped away tears. A white rose and a red rose symbolising her party were left on the bench where she used to sit.
Donations topped £1 million ($1.46 million, 1.3 million euros) to a memorial fund to support causes she backed, such as The White Helmets search and rescue volunteers in Syria.
Minutes before the parliamentary session opened, Cox's alleged killer, 52-year-old Thomas Mair, appeared in court in London via video link from prison after being charged at the weekend with her murder.
During a short hearing, he spoke only to confirm his name and was ordered to remain in custody. Asked to give his identity at a lower court on Saturday, he had replied: "Death to traitors, freedom for Britain."
- Outrage over poster -
A close friend of Cox in parliament, Stephen Kinnock, said the lawmaker would have been "outraged" by Farage's Brexit campaign poster.
"Jo understood that rhetoric has consequences. When insecurity, fear and anger are used to light a fuse, then the explosion is inevitable," he warned.
The author of the Harry Potter series J.K Rowling called the campaign "one of the most divisive and bitter political campaigns ever waged" in Britain on her website.
Despite the criticism, Farage said the poster was an accurate depiction of the refugee crisis in the EU and accused his rivals of unashamedly using Cox's death to boost their cause.
Farage has admitted the killing took the momentum out of the Brexit campaign.
"The 'Remain' camp are using these awful circumstances to try to say that the motives of one deranged, dangerous individual were similar of half the country or perhaps more who believe we should leave the EU," he told the BBC.
- 'Hate and xenophobia' -
But a senior member of Cameron's ruling Conservatives, former party chair Sayeeda Warsi, said she was withdrawing support for "Leave" because of the poster.
"Are we prepared to tell lies, to spread hate and xenophobia just to win a campaign?" she asked.
Farage dismissed her defection, describing it as a "Number 10 put-up job" -- a reference to Cameron's Downing Street office -- and cast doubt on whether she had ever really been part of the Brexit camp.
The British referendum has opened the prospect of other nations demanding a vote, too, perhaps placing in peril the very survival of the European project, which was born out of a determination to forge lasting peace after two world wars.
"Whatever the UK vote is, we must take a long hard look on the future of the Union. Would be foolish to ignore such a warning signal," EU president Donald Tusk wrote on Twitter.
- 'Stay with us' -
In a television appearance in which he was grilled by audience members, opposition Labour leader Jeremy Corbyn, who is campaigning for "Remain", said voters "may well" vote to leave.
"If we remain, I believe Europe has got to change quite dramatically to something much more democratic, much more accountable," Corbyn said.
While the "Remain" camp has tried to focus on the potential economic damage that Brexit could inflict, the "Leave" campaign held out the promise of Britain taking better control of immigration if it leaves the EU.
The "Leave" and "Remain" sides have now battled each other to a stalemate, with each on exactly 50 percent support, according to an average of the last six polls calculated by research site What UK Thinks.