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
Children, tourists, politicians, nuns and the people of London came together in Trafalgar Square to remember those who lost their lives in Wednesday's attack.
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A former neighbour of Khalid Masood, the man named by police as the attacker, says she is "sickened" to think about what happened.
The Luton resident remembers him wearing leisure wear and playing with his two children in the garden.
Another former neighbour, a Polish woman, tells the BBC that he was like a "shadow".
She describes him as a "large man with a beard" who walked around late at night, often in black clothes and a black beanie hat.
Masood, 52, most recently lived in the West Midlands but previously lived in Luton.
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A crowdfunding page set up to raise money for PC Keith Palmer's family has exceeded its £250,000 target.
More than 12,000 people donated to the JustGiving , external website, which was set up by the Metropolitan Police Federation following PC Palmer's death on Wednesday.
"All over London and the rest of the UK, police officers risk their lives to protect and defend us," said Stephen Redgewell, who set up the page.
BBC News Channel
BBC security correspondent Frank Gardner says Khalid Masood, the man identified as the attacker, was a "strange character".
He told BBC News that locals described him as "the Vampire" because he usually went out at night and dressed in black.
Our correspondent said it is unlikely Masood, 52, acted alone.
"There's no such thing as a lone wolf attack," he said.
Three people were killed, along with the assailant, in Wednesday's attack.
Tributes have poured in for the victims: PC Keith Palmer, Kurt Cochran and Aysha Frade.
Around 40 people were also injured, of whom 29 needed hospital treatment.
Image source, Getty ImagesHundreds attended a vigil in Trafalgar Square
A massive police operation is under way after Wednesday's terror attack in Westminster, in which the attacker and three other people, including a police officer, died.
These are the latest developments:
Prime Minister Theresa May has visited victims of the terror attack as they recover in hospital.
She spent around 40 minutes at Chelsea and Westminster Hospital, speaking with the injured and medical staff.
Many of those hurt on Westminster Bridge were also taken to St Thomas' Hospital, which faces the Palace of Westminster across the River Thames.
Sam Francis
BBC News, London
Maxine Marshall said tonight reminded her why she loves London.
"I moved here 40 years ago from the United States and I'm still constantly amazed by this city - the diversity, the richness, the resilience.
"When I saw this vigil was on I said 'I need to be there and be with good people'.
"When you're in the heart of darkness that's what you need to do."
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BBC News, London
Dr Atta ul Quuddus and his Muslim community group walked around the vigil in Trafalgar Square offering help and answering questions.
"You can not expect this from human beings," he said.
"We stand here in solidarity with people of this country.
"Everyone here today understands it's crazy people with no sense of humanity who carry out these attacks, not a community."
Home Secretary says the intelligence agencies can't monitor everyone known to them round the clock.
Read MoreThe second Romanian person injured in the attack has been named by the country's UK embassy as Andrei Burnaz.
He is understood to be the partner of Andreea Cristea, the Romanian woman who fell from Westminster Bridge into the River Thames during the attack.
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London Mayor Sadiq Khan has vowed to send a clear message that “Londoners will never be cowed by terrorism”.
He told crowds at Trafalgar Square in London: “Those evil and twisted individuals who tried to destroy our shared way of life will never succeed and we condemn them.
“Our hearts are with the family and friends of PC Keith Palmer, of Aysha Frade, of Kurt Cochran and all those injured in the attack yesterday.
Image source, AFP/GettyHe continued: “The victims were people came from all corners of our world.
"This is a time to express our gratitude to the heroism of our police officers and emergency services who ran towards danger to help and at the same time to encourage others to run to safety.
“London is a great city full of amazing people from all backgrounds and 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.
“Our response to this attack on our city, this attack on our way of life, this attack on our shared values, shows the world what it means to be a Londoner.”
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Sam Francis
BBC News, London
Andy Mortimer, 44, said he was "devastated" by the deaths and that is why he is attending tonight's vigil.
"To die like that is awful. I've worn my jacket to pay my respect to the people that died," he said.
Lucy Wilson, 37, said: "Yesterday reminds us to keep vigilant and stay strong together. To unite as one nation, not just Londoners.
"Today will show unity and solidarity."
Sam Francis
BBC News, London
Rumi Begum, 33, has attended the vigil in Trafalgar Square for her sister who narrowly escaped Wednesday's attack.
"She was meeting her friend near Westminster Bridge but left to pick up her kids from school just minutes before the attack," Ms Begum said..
"She heard the crash, saw the panic and decided just to run. You have to.
"My sister is now home with her kids. I'm here for myself and for her to show our support and pay our respects.
"As Londoners we have a bond because we know London is so vulnerable but so strong and there's people from every background here - there's children here - saying we won't run away."
