The mother of Westminster attacker Khalid Masood has said she is “shocked, saddened and numbed” by his actions.
Janet Ajao said she had “shed many tears for the people caught up in this horrendous incident”.
Masood killed three people when he drove a car into pedestrians last Wednesday. He then fatally stabbed a police officer before being shot dead.
Meanwhile, police say no evidence has been found of links between Masood and so-called Islamic State or al-Qaeda.
Mrs Ajao, from Trelech in Carmarthenshire, said: “I wish to make it absolutely clear, so there can be no doubt, 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.”
Masood, 52, who was born as Adrian Elms but later took his stepfather’s name Ajao, carried out his attack within 82 seconds.
It has emerged that police believe he drove up to 76mph as he crossed Westminster Bridge.
The Islamic State group has said it was behind the attack.
But Deputy Assistant Commissioner Neil Basu, of the Metropolitan Police, told BBC Panorama that, while Masood “clearly had an interest in Jihad”, police had so far found no evidence of an association with the group or al-Qaeda, or that he had discussed his plan with others.
He said: “His methods appear to be based on low sophistication, low tech, low-cost techniques copied from other attacks, and echo the rhetoric of IS leaders in terms of methodology and attacking police and civilians, but I have no evidence or information at this time that he discussed this with others.”
Mr Basu also said there was also no evidence Masood was radicalised in prison in 2003 – describing this as “speculation”.
He said Masood was not considered to be a threat by the security services or counter-terror police and was not part of investigations connected with Luton – where he had once lived – or the long-banned al-Muhajiroun network.
He added: “I know when, where and how Masood committed his atrocities, but now I need to know why. Most importantly so do the victims and families.”
Masood’s victims were PC Keith Palmer – who was stabbed outside Parliament – Aysha Frade, who was in her 40s and worked at a London sixth-form college, US tourist Kurt Cochran, 54, and retired window cleaner Leslie Rhodes, 75, from south London.
Thirteen people are understood to remain in hospital.
It understood the car Masood used was seen driving in the area around the bridge at some point before the attack.
It may have been on the day or before that, although it remains unclear what the purpose of this was.
It is also understood Masood’s phone connected with messaging app WhatsApp minutes before the attack, which police say started at 14:40 GMT.