Three people were killed in the London terror attack outside the Houses of Parliament, with 40 others wounded.
Police said 40 were injured after the attacker ploughed a car along a pavement on a bridge before stabbing the police officer outside the parliament.
Here is what we know about the victims so far.
The police officer killed has been named as 48-year-old Keith Palmer, a husband and father who was part of the parliamentary protection force.
Tributes have poured in from across the country for Palmer, who was unarmed and was stabbed to death just inside the vehicle entrance gates to parliament.
Palmer had been in the police for 15 years.
He previously served in the British army alongside James Cleverly, now a Conservative MP, who tweeted: "A lovely man, a friend. I'm heartbroken."
Cleverly paid an emotional tribute to his friend in the House of Commons and asked that he receive a posthumous award for his actions.
British police said one of the victims run down and killed by the attacker was a woman in her mid-40s.
A Spanish diplomatic source confirmed to AFP that she was a 43 year-old British citizen named Aysha Frade, whose mother was Spanish.
Media reports said she was on her way to pick up her two daughters, aged seven and nine, from school.
Rachel Borland, principal of DLD College London where Frade worked in the administration team said she was "highly regarded and loved by our students and by her colleagues".
"She will be deeply missed by us," she added.
In the hours after the attack sowed confusion on heavily-trafficked Westminster Bridge, Colleen Anderson, a junior doctor at the nearby St Thomas' Hospital, said she had confirmed the death of a woman at the scene.
"She was under the wheel of a bus," she said, without explaining how the victim came to be under the bus.
British police said the third victim was a man in his mid-50s but provided no further details.
Westminster Bridge is a busy tourist spot with its views of parliament's Big Ben clock tower, and the injured included several foreigners.
Police said 29 of around 40 people wounded were treated in hospital. Seven remained in a "critical condition" on Thursday.
Three French pupils, aged between 15 and 16, on a school trip to London were among those hurt, including two who suffered broken bones but were not reported to be in life-threatening condition.
The teenagers are from a high school in Concarneau, in the western Brittany region, and were joined by their families on Wednesday evening.
Five South Korean tourists -- four women and a man in their 50s and 60s -- were also wounded after being knocked to the ground by people trying to flee as the assailant mowed down pedestrians in a car, Seoul's foreign ministry said.
In her address to parliament on Thursday morning, Prime Minister Theresa May listed four South Koreans as injured.
She also said that 12 Britons had been admitted to hospital as well as two Romanians, one German, one Pole, one Irish, one Chinese, one Italian, one American and two Greeks.
The injured also included three police officers who were returning from an event to recognise their bravery.
"Two of those three remain in a serious condition," May added.
A woman with serious injuries was rescued from the River Thames near Westminster Bridge after the attack. No mention was made of her name or nationality.
Among the British injured were four students from Edge Hill University in Ormskirk in northwest England who were on an educational visit to the Houses of Parliament.
Two of whom were described as "walking wounded".