London Police have revealed more chilling details of the mere 82 seconds it took Khalid Masood to massively alter the course of so many lives.
Driving at more than 120 kilometres per hour as he crossed Westminster Bridge, he killed three pedestrians and injured dozens more.
He then fatally stabbed a police officer before being shot dead.
Self proclaimed Islamic State militants say Masood carried out the attack on their behalf.
But Chief Constable Jon Boutcher from Bedfordshire Police says there's no evidence to support that claim.
He's not a soldier. I would probably describe him as somebody who's been exploited and a man who is clearly a lone actor, someone who has come up from the basement so to speak to commit a murderous and cowardly attack.
Police also say there's no evidence the 52 year old was radicalised while in prison in 2003, or that he was a threat to national security prior to the attack.
But they have revealed that Masood had driven around the area in his hire car beforehand, possibly on some sort of reconnaissance mission.
And that he had also used the encrypted messaging service, Whatsapp-- just minutes before he began mowing down pedestrians.
Danny Smith is a father of two who was viciously attacked by Masood 15 years ago-- during an altercation at a pub.
He says based on his experience-- Masood should never have been released from prison.
He's pulled a knife out, and flinched to see what my reaction would be. I didn't flinch, I just stood there and thought "surely he's not going to stab me for this". And then just full on punched me, stabbed me in the face.
Among those killed in the Westminster attack was American tourist Kurt Cochrane-- who was visiting London with his wife, Melissa.
She suffered multiple injuries, and remains in hospital.
Her brother Clint Payne, together with other family members have thanked the public for its support.
"This has been a humbling a difficult experience. But we've felt the love of so many people during these past several days. It's been a tender experience for our family to be together with Melissa here. Her health is steadily improving and she has been strengthened by the presence of her family."
The Paynes are a Mormon family, and say they've found strength in their faith.
"He left a legacy of generosity and service that continues to inspire us. We are deeply saddened to lose him but are grateful that the world is coming to know him."
Melissa's sister Sarah McFarland says in the midst of tragedy, they're following Kurt's example-- of focusing on the positive.
"None of us harbour any ill will or harsh feelings towards this. So we love our brother, we love what he brought to the world and we feel like that this situation is going to bring many good things to the world."
Khalid Masood's mother, Janet Ajao, has since released a statement, condemning her son's actions.
She says she has "shed many tears" for the people caught up in what she calls "this horrendous incident".
The statement reads, "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."
"I wish to thank my friends, family and community from the bottom of my heart for the love and support given to us."
Her brother Clint Payne, together with other family members have thanked the public for its support.
"This has been a humbling a difficult experience. But we've felt the love of so many people during these past several days. It's been a tender experience for our family to be together with Melissa here. Her health is steadily improving and she has been strengthened by the presence of her family."
The Paynes are a Mormon family, and say they've found strength in their faith.
"He left a legacy of generosity and service that continues to inspire us. We are deeply saddened to lose him but are grateful that the world is coming to know him."
Melissa's sister Sarah McFarland says in the midst of tragedy, they're following Kurt's example-- of focusing on the positive.
"None of us harbour any ill will or harsh feelings towards this. So we love our brother, we love what he brought to the world and we feel like that this situation is going to bring many good things to the world."
Khalid Masood's mother, Janet Ajao, has since released a statement, condemning her son's actions.
She says she has "shed many tears" for the people caught up in what she calls "this horrendous incident".
The statement reads, "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."
"I wish to thank my friends, family and community from the bottom of my heart for the love and support given to us."
