Two people have 'life-threatening injuries'published at 18:21 Greenwich Mean Time 23 March 2017
Five people injured in the attack remain in a critical condition and two have life-threatening injuries, police say.
Man, 75, who died in Westminster attack is named as Leslie Rhodes, from Clapham, London
Westminster attacker Khalid Masood, 52, was originally called Adrian Russell Elms
Masood spent two years teaching English in Saudia Arabia between 2005-2009
Four people are still being questioned by police, six have been released
Fifty people hurt in attack, two in critical condition, one has life-threatening injuries
Prince Charles visits attack victims at King's College Hospital in London
Paul Gribben, Kate Palmer and Marie Jackson
Five people injured in the attack remain in a critical condition and two have life-threatening injuries, police say.
Jodie Halford
BBC News
People gathered in Trafalgar Square stand together quietly, respectfully, flanked by police officers with the rumble of helicopters a constant presence above.
Reporters from around the world are here too, quietly questioning some of those who have come and are resting on the edges of the fountains.
The people of London and visitors to the city have come together to remember the people who lost their lives in Wednesday's attack.
The word "solidarity" is heard over and over again
Candles are laid on the floor and on the steps leading to the National Gallery, waiting to be lit in memory of those who died.
I've spoken to a German woman who has lived here for decades, whose husband did not feel safe enough to join her this evening.
But she is here because she does not want terrorism to stop her from living her life.
Her view is echoed by almost everyone I have spoken to around the square.
As the bells of St Martin's in the Fields chimed, the crowds fell silent.
Even the rumble of the police helicopters dimmed while those gathered here paused to think about yesterday's events.
Some filmed the scene on their phones, some cast glances across the crowds, but the focus was on three candles on the steps leading up to the National Gallery, above which MPs, religious figures and others stood in a line to pay their respects.
London Mayor Sadiq Khan described yesterday's incident as an "attack on our shared values" in a speech ahead of the minute's silence to remember victims.
He told the crowd gathered at Trafalger Square: "When Londoners face adversity we always pull together.
"We stand up for our values and we show the world we are the greatest city in the world."
Crowds gathering for the vigil in Trafalgar Square in London have applauded Home Secretary Amber Rudd after she told them "we will defeat" terrorists.
"We showed that by coming together, by going to work, by getting about our normal business because the terrorists will not defeat us."
She added: "I want us to say thank you to all for the great sacrifice the police and emergency services take."
The Independent Police Complaints Commission has said "no police officers are under investigation" over the Westminster terror attack, but it is "currently investigating the circumstances".
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Friends have been paying tribute to Kurt Cochran, one of the victims of the attack.
Mr Cochran, from Utah in the US, was on holiday in London with his wife to celebrate their 25th anniversary.
Karlie Matthews, who lives in Salt Lake City in Utah and knew him personally, and described what sort of person he was:
Quote MessageI think the best word to describe him would be "genuine". He was just a man who had a good heart. I think that's the tragic part of it is that him and his wife - you know those marriages that you see and you're like 'man I want that one day', that's it you know, and they had one of those marriages. They loved each other and valued each other so much and my heart just breaks for her, and yeah, it's rough.
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Detectives are continuing to search a number of addresses linked to their investigation:
Searches at addresses in Brighton and south-east London have now concluded.
A 39-year-old woman was arrested at an address in east London on suspicion of preparation of terrorist acts.
A 21-year-old woman and a 23-year-old man were arrested at an address in Birmingham.
A 26-year-old woman and three men aged 28, 27 and 26 years old were arrested at a separate address in Birmingham.
All six were arrested overnight on suspicion of preparation of terrorist acts.
A 58-year-old man was also arrested this morning at a separate address in Birmingham on suspicion of preparation of terrorist acts.
Huge chalk drawings containing messages of peace and hope appear on the ground in Trafalgar Square.
Read MoreAndreea Cristea, the Romanian woman who fell from Westminster Bridge during the attack, was rescued from the River Thames by fire crews supported by the RNLI.
The Romanian ambassador to the UK, Dan Mihalache, said she was suffering problems with her lungs and had a blood clot removed from her brain overnight.
Berlin's iconic Brandenburg Gate has been lit up by a huge union jack projection in honour of the victims of the attack in Westminster.
On Wednesday, Paris showed its solidarity with the British when the lights on the Eiffel Tower were turned off at midnight.
The Romanian embassy in London have confirmed that Andreea Cristea is the person who fell from Westminster Bridge during the attack.
A Romanian couple injured in the Westminster attack have been named as Andrei Burnaz and Andreea Cristea.
Ms Cristea suffered multiple injuries and has undergone complex surgery while her boyfriend sustained a broken foot, according to the Romanian ambassador to the UK.
The two were on a trip to London to celebrate Mr Burnaz's birthday and are planning to marry, Dan Mihalache told the Romanian news agency Agerpress, external .
Prime Minister Theresa May has added her message to the book of condolence in Westminster Hall. It reads:
Quote MessageThis terrorist attack was an attempt to silence our democracy. It failed and today we send our condolences to the family and friends of those who lost their lives and our thoughts to the injured. And we will always be grateful to the police and emergency services whose bravery and dedication thwarted this attack and showed the best of our values. This place is the heart of our democracy and a symbol of our traditions and our values. As we mourn those who lost their lives we are clear – Our values will prevail.
Transport for London are advising drivers and commuters to avoid Trafalgar Square and the surrounding roads ahead of the candlelit vigil. It says extensive road closures are in place.
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Watch our Facebook Live coverage of the vigil being held in London's Trafalgar Square this evening.
People have been laying flowers and lighting candles to remember victims of yesterday's attack.
Just last March, people gathered in the same location to remember victims of the bombings in Brussels.
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