Politicians have been warned to review their security after Labour MP Jo Coxwas shot and stabbed to death in the street outside her constituency advice surgery.
A Number 10 spokeswoman said a reminder of safety guidance has been sent out to MPs after Mrs Cox was attacked in Birstall, West Yorkshire.
The advice includes steps representatives can take to stay safe when they are “out and about” and suggests if they have any concerns they should contact their local police.
Mrs Cox, mother of two children, aged three and five, was attacked by a man reportedly shouting “Britain first” at lunchtime on Thursday.
Her death comes three months after a man was cautioned for sending her “malicious communications”, but police have confirmed this was not the same man who was arrested on Thursday following the attack.
Witnesses said her assailant kicked and stabbed her and then shot her several times, the final shot aimed at her head.
The alleged gunman has been named locally as Tommy Mair (52) who neighbours in Birstall have described as “a loner”. He was arrested near the scene soon after the attack.
The MP’s husband Brendan said: “Today is the beginning of a new chapter in our lives. More difficult, more painful, less joyful, less full of love.
“I and Jo’s friends and family are going to work every moment of our lives to love and nurture our kids and to fight against the hate that killed Jo.
“Jo believed in a better world and she fought for it every day of her life with an energy and a zest for life that would exhaust most people.
“She would have wanted two things above all else to happen now: one, that our precious children are bathed in love, and two, that we all unite to fight against the hatred that killed her.
“Hate doesn’t have a creed, race or religion, it is poisonous.
“Jo would have no regrets about her life, she lived every day of it to the full.”
Labour leader Jeremy Corbyn said the country would be “in shock at the horrific murder” of a “much-loved colleague”.