It follows the fatal stabbing of MP David Amess in an attack at his constituency surgery on Friday.
A spokesman for Home Secretary Priti Patel said: "This afternoon, the Home Secretary chaired a meeting of the Police, Security and Intelligence Agencies to discuss the tragic incident in Southend and the ongoing response. She also spoken to the Speaker of the House of Commons.
"The Home Secretary has asked all police forces to review security arrangements for MPs with immediate effect and will provide updates in due course."
Ms Patel earlier condemned the killing of Sir David Amess as an "attack on democracy", which raises renewed questions about the security of MPs.
Ms Patel in a series of Tweets expressed concern that 69-year-old Sir David was fatally stabbed while holding a constituency surgery in his Southend West seat.
His death came just five-and-a-half years after Labour MP Jo Cox was killed by a far right extremist in her Batley and Spen constituency in West Yorkshire. There has been a history if violent attacks on MPs.
Ms Patel said she was "devastated" by the loss of Sir David, who she described as a "kind and loyal friend".
"That he was killed while going about his constituency duties is heart-breaking beyond words. It represents a senseless attack on democracy itself," she said int he tweets.
"Questions are rightly being asked about the safety of our country's elected representatives and I will provide updates in due course."
Commons Speaker Sir Lindsay Hoyle said he was "shocked and deeply distressed" at what had happened and that MPs' security would need to be re-examined.
"This is an incident that will send shock waves across the parliamentary community and the whole country," he said.
"In the coming days we will need to discuss and examine MPs' security and any measures to be taken, but for now, our thoughts and prayers are with David's family, friends and colleagues."
The Speaker said he has discussed the security of MPs with the Home Secretary following the killing of Sir David Amess.
He warned against “knee jerk reactions” but said safety measures for MPs are “always being looked at”.
Speaking to Sky News, he said: “Obviously I won’t go into the details of what we do, but I will say we won’t sit on our laurels.”
He added: “We don’t want a knee jerk reaction now... of course we are going to be looking into these issues and I am speaking with the Home Secretary already. We are getting reassurances out there to MPs, and in fairness chief constables up and down this country are speaking to MPs to reassure them.
“It’s about reassuring people at this stage, and then afterwards we will take further measures if we need to.”
Despite the sense of shock and grief across Westminster, the Father of the House - longest-serving sitting MP - Sir Peter Bottomley said MPs would want to continue to meet their constituents in person.
"I predict all over the country this weekend, next weekend and in the months to come MPs will hold advice sessions. That is what we do. When there is a challenge we have to face it," Sir Peter said.
"There is no perfect security for anybody. My view has always been that in many other walks of life you are at far greater risk than a Member of Parliament.
"MPs may get exceptional publicity. We are not exceptional people. We're ordinary people trying to an ordinary job as well as we. We accept the risks.
"Being diligent and being vigilant are part of being an MP. I imagine the local police will be having discussions with MPs.
"The question is should MPs stop meeting their constituents face-to-face. The answer is we will go on meeting our constituents face to face.
"Often were are the last people who can help them when they are facing desperate troubles. Their needs, their interests come first."
As well as the killing of Ms Cox in June 2016 in the days before the Brexit referendum, the attack on Sir David carried echoes of two earlier incidents when MPs were attacked in their constituencies.
In May 2010, East Ham MP Stephen Timms was stabbed twice in the abdomen by Roshonara Choudhry, an Islamic extremist who claimed she had wanted "to get revenge for the people of Iraq".
Mr Timms suffered serious injuries and according to police was "extremely fortunate not to have been killed". He remains an MP.
Nigel Jones, then MP for Cheltenham, was severely injured in January 2000 when he was attacked in his offices by a man with a sword.
Andrew Pennington, a Gloucestershire county councillor, was killed in the same attack while trying to defend the then-MP.