Police have warned election candidates and canvassers against campaigning alone, amid safety fears.
Those on the campaign trail should work in pairs, have a charged mobile phone and let people know where they are, police have advised.
It comes after MPs voiced concerns that there could be violence ahead of the December 12 poll, following another extension to the Brexit deadline.
Labour candidate Tracey Brabin and Liberal Democrat candidate Luciana Berger have both ruled out canvassing alone in the dark.
Ms Berger tweeted last week that she had experienced a group of men “jeering and shouting traitor" at her, which prompted her decision to campaign only in daylight hours.
Assistant Chief Constable Gary Cann, the lead on elections for the National Police Chiefs' Council, told the BBC: "It is right to say that these things usually pass off without significant incident and we have no particular reason to think it will be any different this time but we of course want people to look after their own safety.”
The poll next month is to be the first December election since 1923.
In 2016, Labour MP Jo Cox was shot and stabbed to death in her Yorkshire constituency during the campaign leading up to the EU referendum.
Earlier this year Boris Johnson faced a backlash after he responded “humbug” to claims that “inflammatory language” contributed to death threats and abuse towards MPs.
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