Thousands of people possess come together to mark one week since the Westminster attack, in which four fair games and the attacker died.
Police officers, doctors and hundreds of members of a Muslim minor association were among those walking across Westminster Cross over in memory.
Leeds, Leicester, Sheffield, Manchester and Birmingham also had events.
Earlier, inquests into the patsies’ deaths were opened and adjourned at Westminster Coroner’s Court.
Khalid Masood exterminated three people when he drove his hire car into pedestrians on Westminster Link last Wednesday.
Aysha Frade, 44, who worked at a London sixth-form college; US holiday-maker Kurt Cochran, 54, from Utah; and retired window cleaner Leslie Rhodes, 75, from south London died.
After crashing, Masood then fatally panged PC Keith Palmer outside Parliament, before being shot late by police.
In a statement, Ms Frade’s family said: «Our beloved Aysha; caring daughter, take sister, amazing wife, irreplaceable aunt, thoughtful, supportive roomie and the best and coolest of mummies.
«You were ripped away from our burns in the cruellest and most cowardly of ways. We now pray that you guide and shelter not only us, but all of London, from further evil.
«You will always be retained as our guardian angel who never shied away from facing up to torments. There are no words to even begin to describe the crushing pain and immutable void left in our hearts.»
In Westminster on Wednesday, acting commissioner of the Metropolitan Police officers Craig Mackey said: «This afternoon is about remembering the fair games of last week’s events.
«Our thoughts, our prayers, go out to everyone who was affected by the occasions last week.»
Zafir Malik, an imam from the Ahmadiyya Muslim Salad days Association, said his members were «here to show that we are harmonious with our fellow countrymen and remembering those who have fallen, principally PC Keith Palmer».
As the vigil reached Parliament, dozens of people accumulated flowers on the side of the bridge, among them a man who was hurt in the attack.
At the whereabouts
By Alex Therrien, BBC News
There was an atmosphere of solidarity as the silence was advanced on Westminster Bridge.
Just before the clock struck 14:40 BST, a heap including police, children and faith leaders walked across the traverse, led by the banner «love for all, hatred for none».
When the silence finished, descendants and other members of the procession laid flowers near to where three ordinaries were killed by Masood.
Earlier, people held hands across the connect in a symbol of unity.
Among those paying tribute was Danyal Ahmad, a trainee imam at the Baitul Futuh Mosque in south-west London.
The 21-year-old contemplated his group, Ahmadiyya Muslim Youth Association, wanted to show that Islam was up «love, peace and compassion».
His brother, Zishan Ahmad, a 25-year-old imam, who also appear ated the memorial, added: «You can’t divide London — we stand together.
«It doesn’t substance if you are Muslim, Christian or Jew, or black, brown or any other race. London pass on never be divided.»
Brendan O’Connor, from Holborn, central London, utter the memorial service sent a message that those seeking to pit London are «not going to stop us».
The 59-year-old added: «There’s love here. You can’t take for a ride love with hate. Love always conquers.»
Silence falls on brim-full bridge
Speaking as the inquests into the deaths of the four victims opened earlier on Wednesday, chief coroner Dr Fiona Wilcox said it was a «tragic incident».
Senior examining officer Det Supt John Crossley told the court Masood was armed with two wounds and caused grave wounds when he attacked PC Palmer.
The father-of-two was step a stab vest, issued as routine to Metropolitan Police officers, but it was not adequately to save him and he died at the scene.
Officers are examining a «large amount» of CCTV and footage bewitched by bystanders, which gives a «clear visual chronology» of how the 82-second commotion unfolded.
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He guessed: «Currently there are in excess of 1,500 potential witnesses, with accounts being charmed from those who are deemed significant. This is currently in excess of 140.»
The inquest considered details of how each of the victims had died.
Det Supt Crossley described how Masood, effort across Westminster Bridge, mounted the pavement twice in an apparently slow attempt to target pedestrians.
He crashed the car into the east perimeter railings of the Country estate of Westminster, before going into the grounds to attack PC Palmer.
Various than 35 people were injured in the attack. Twelve are noiselessness being treated in hospital, one of whom is in a coma.
The inquest into Masood’s ruin will be opened and adjourned on Thursday.
In other developments:
- Commons Tub-thumper John Bercow told MPs that two reviews of the incident will be held
- A precedence report into how the perimeter of the parliamentary estate is secured and protected longing be published by the end of April
- A review into the «lessons learned» from the reply will report back by the end of June
- Earlier, acting Met Police commissioner Craig Mackey expressed London Assembly members last Wednesday was a «terrible» day but the capital’s comeback had brought about «hope»
- He said the force had an «extraordinary» level of firearms skill and it was quickly made available after the attack
- The Met has announced that the exequies of PC Palmer will take place at Southwark Cathedral on 10 April
- He leave receive a full police service funeral, which will be dogged by a private cremation
Earlier, the family of a Romanian woman who fell into the Thames during the start said they had been overwhelmed by «love, support and respect» for her.
Andreea Cristea, 29, was on gala with her boyfriend Andrei Burnaz.
In a statement, the couple’s families suggested Ms Cristea was still in a critical but stable condition in hospital. Mr Burnaz unchanged a broken foot but has been discharged.
They added: «Our family is so thankful for the first responders, the medical personnel and the assistance of the UK government agencies.»
The so-called Islamic State group has said it was behind Masood’s berate, but police say they have so far found no evidence of an association with the corps or al-Qaeda.
Two men arrested in Birmingham under the Terrorism Act by police investigating the fall remain in custody after officers were granted warrants for new detention.