Survivors of the Finsbury Park terrorist attack in London are urging countries across the world, including Australia, to make sure they are combatting the threat posed by far-right extremism.
Overnight, 48-year-old Darren Osborne from Cardiff was jailed for life and will spend a minimum term of 43 years behind bars for ploughing a van into a crowd of worshippers near a mosque in June.
The attack killed Makram Ali, 51, and injured nine others.
In sentencing, Justice Cheema-Grubb said Osborne was "rapidly radicalised over the internet by those determined to spread hatred of Muslims".
"Your use of Twitter exposed you to racists and anti-Islamic ideology," she said.
Muslim leaders say authorities in western countries cannot afford to dismiss the attack as an isolated case and they want more done to tackle far-right propaganda online.
"The Government has to do something about what goes on social media," said Khalid Oumar from the Finsbury Park Attack victims' voice forum.
"It's quite relevant to the rise of hate crime.
"We get a lot of calls and threats in the community."
'Flashbacks are constant': survivor
Abdirahman Ibrahim was injured during the attack.
His physical wounds have healed but the mental scars remain, and he is still coming to terms with how lucky he is to be alive.
"I wouldn't wish this on anyone," he said.
"The flashbacks are constant. It's starting to get a bit better now but I don't think I'll ever get over it."
He believes governments across the world need to put more resources into education to ensure different religious and ethnic communities understand each other.
"Everyone needs to come together. All politicians, all leaders," he said.
"Everyone should know that hatred doesn't have a religion or a culture. We don't want this to happen again."