The mother of Streatham terrorist Sudesh Amman has told Sky News he was a "nice, polite boy" who was radicalised online and in prison - and revealed she spoke to him just hours before the attack.
Amman was wearing a fake bomb vest when he stabbed two people before being shot dead by police on a busy street in south London on Sunday afternoon.
The 20-year-old from Harrow, north London, had been recently been released from prison after serving time for spreading extremist material.
In an interview with Sky News, Amman's mother Haleema Faraz Khan said her son seemed "normal" when he visited him at a bail hostel on Thursday and he called her hours before Sunday's attack asking her to make him some mutton biryani.
Fighting back tears, she said she could not believe her "polite and lovely boy" who was "always smiling" could do something like this.
She said she believed her son had become radicalised after watching Islamist material online and while in high security jail Belmarsh.
"I spoke to him on the phone on Sunday," Ms Khan said.
"He said: 'Mum I want some biryani.... your mutton biryani'.
"He was fine when I went to see him.
"I don't understand, he came from the prison last week only.
"He became more religious inside prison, that's where I think he became radicalised.
"He was watching and listening to things online which brainwashed him.
"Before he went to prison he was not that religious after he came out he was really religious.
"He was a polite, kind, lovely boy. He was always smiling.
"I'm so upset, he was only 20 years old."
Ms Khan said when she first heard an attack had happened she "had a feeling" he was responsible because it was in south London.
"I saw it on the TV, that's when I knew it was him," she said.
"His name was there. That was the first time I heard.
"He didn't answer his phone, I tried to ring him [after the attack]."
Ms Khan said she wanted to bury her son quickly but his body has not yet been released.
Park High School in Stanmore, Harrow confirmed Amman attended between 2011 and 2016.
A man who said he was friends with Amman at school told Sky News he had shown "no signs of extremism".
He added: "It really is a shame that he has done such a tragic thing, as I believe that Sudesh really had potential to make it far in life."
He said the last time he saw Amman was in 2018, adding: "I bumped into him, he seemed a little dazed, as if in a rush as far as I can remember. It really is a shame."
Watch the latest videos from Yahoo UK