British police has confirmed that a 75-year-old man injured in yesterday's terror attack in London has died.
His death brings the total number of people killed in the attack to five. Six people remain in a critical condition in hospital.
The man who carried out the attack, named earlier as British-born Khalid Masood, was shot dead by police yesterday.
The other victims of the attack were: police constable Keith Palmer; Aysha Frade, "a highly regarded and loved" member of staff at DLD College London and American tourist Kurt Cochran, from Utah.
Police said Masood, 52, was not the subject of any current investigations and there was "no prior intelligence about his intent to mount a terrorist attack".
However, he was known to police and had a range of previous convictions for assaults, including Grievous Bodily Harm, possession of offensive weapons and public order offences.
Masood was born in Kent, England, and detectives believe he was most recently living in the west midlands.
He was also known by a number of aliases, the Metropolitan Police said.
Earlier, a candlelit vigil took place at London's Trafalgar Square, where the Mayor of London Sadiq Khan praised the bravery of the emergency services responding to the incident.
He told the assembled crowd that "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."
Islamic State claims responsibility for Westminster attack
The so-called Islamic State claimed responsibility for the attack outside the UK parliament, according to its news agency.
The Amaq news agency said the attacker was a "soldier of the Islamic State".
It comes as British Prime Minister Theresa May said that one Irish person was among those injured in yesterday's Westminster terror attack.
Tánaiste Frances Fitzgerald told the Dáil that their injuries are not life threatening.
Speaking in Parliament this morning, Mrs May said the victims admitted to hospital included 12 Britons, three French children, two Romanians, four South Koreans, one German, one Pole, one Irish, one Chinese, one Italian, one American and two Greeks.
Mrs May said the government was in close contact with counterparts in all the countries affected.
Detectives investigating the attack arrested three women and five men on suspicion of preparing terrorist acts.
The suspects were held in raids in London and Birmingham as neighbours of Masood spoke of their shock.
Mark Rowley, the Metropolitan Police's senior anti-terror officer, said six addresses were raided overnight.
Mr Rowley said it was still his belief the attacker worked alone and was inspired by "international terrorism", adding that there was no specific information to suggest any further threat to the public.
Acting Deputy Commissioner Mark Rowley updates media on the UK's ongoing counter terrorism operation. pic.twitter.com/fjreqTKfpI
— RTÉ News (@rtenews) March 23, 2017
A man who witnessed a raid on an address in Birmingham overnight told the Press Association: "The man from London lived here."
Officers stormed a second-floor flat above a row of shops on Hagley Road at around 11pm, the witness said.
He added: "They came and arrested three men."
One of the flat's windows was covered in cardboard, with non-uniformed officers spotted taking pieces of equipment into the property.
As he was describing the events, the witness was interrupted by a police officer, who had been guarding the scene.
He had his details taken and was convinced to go to a police station with another officer.
Parliament sitting as normal despite attack
Both the House of Commons and the House of Lords sat at their normal times today, in a show of defiance in the wake of the attack.
The House of Commons chamber observed a minute's silence at the start of proceedings.
Police officers also marked the silence standing outside the headquarters of London's Metropolitan Police nearby.
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Prime Minister Theresa May praised the bravery of police officers last night as it was announced Westminster would attempt to run as smoothly as normal.
In a statement from Downing Street, she said: "Any attempt to defeat those values through violence and terror is doomed to failure.
"Parliament will meet as normal. We will come together as normal. And Londoners - and others from around the world who have come here to visit this great city - will get up and go about their day as normal.
They will board their trains, they will leave their hotels, they will walk these streets, they will live their lives.
"And we will all move forward together, never giving in to terror and never allowing the voices of hate and evil to drive us apart."
US President Donald Trump was among world leaders quick to offer their support.He tweeted: "Spoke to UK Prime Minister Theresa May today to offer condolences on the terrorist attack in London. She is strong and doing very well."
