LONDON (AP) — British police are unveiling new tactics to protect politicians amid the country’s fraught, even hostile political atmosphere, issuing safety recommendations for candidates running in the country’s Dec. 12 general election.

All 650 seats in the House of Commons are up for grabs in the vote but more than 70 lawmakers have announced they are not running for re-election amid Britain's toxic political atmosphere.

Politicians on both sides of the Brexit argument over Britain’s impending departure from the European Union have received abuse and threats — even death threats — both in person and online. Those leaving include many moderate pro-EU Conservatives, Labour legislators who say their party has not stamped out anti-Semitism and high-profile female legislators, who have received a disproportionate amount of the abuse.

There has also been increasing concerns for British politicians’ personal safety since Labour Party legislator Jo Cox was stabbed to death during the 2016 Brexit referendum campaign.

The National Police Chiefs’ Council said Friday it is urging candidates not to campaign alone if possible and to contact local police in advance of campaigning in specific areas.

It also advises candidates to check that any material they have posted online does not release “sensitive personal information,” data that could possibly aid stalkers or those with malign intentions.

Chairman Martin Hewitt said all police forces will offer security briefings for candidates and will have a senior police officer responsible for handling safety issues.

“We’re not going to tell anyone to limit their campaigning or enthusiasm in any way, but we are taking precautionary steps ourselves and providing sensible advice to candidates,” he said.

The advice will be distributed to all candidates as part of an information package developed by police, the Electoral Commission and prosecutors.

A number of candidates have reported a rise in online threats and there has been more heckling than usual in the early days of the campaign.

Britain is holding a national election on Dec. 12, two years early, because Prime Minister Boris Johnson, a Conservative, wants to secure a majority so he can take the U.K. out of the EU by the next Brexit deadline of Jan. 31.

The campaign has also seen a focus on racism, particularly in the opposition Labour Party, whose leader, Jeremy Corbyn, has repeatedly been accused of taking a lax stance toward anti-Semitism in party ranks.

Twenty-four prominent British writers and entertainers, including author John LeCarre and actor Simon Callow, said Friday they won't vote for Labour Party candidates because of the party's failure to combat anti-Semitism.

Their letter, published in The Guardian newspaper, says Labour is under investigation for institutional racism, two Jewish lawmakers have been bullied out of the party and Corbyn has a “long record of embracing anti-Semites.”

The signatories say these concerns overshadow the argument that supporting Labour is the only way to stop Johnson’s Conservatives from taking the country out of the EU with or without a Brexit deal.

They say to ignore anti-Semitism “because Brexit looms larger is to declare that anti-Jewish prejudice is a price worth paying for a Labour government. Which other community’s concerns are disposable in this way? Who would be next?”

Such a rejection by traditional Labour supporters could hurt the party as it seeks to overthrow the ruling Conservatives. The Conservatives now have 298 seats in Parliament, which is short of a majority, to the Labour Party’s 243, and analysts say the Conservatives need to flip Labour seats in the north and east to win the majority needed to push Brexit through.

Most polls see the Conservatives leading, but for many British voters this year, their feelings about Brexit could trump traditional party loyalties.

Danica Kirka and Jill Lawless contributed to this report.

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