The Grade 6 student says she was with her younger brother when she felt someone behind her.
Authorities are investigating the incident, which occurred at about 9 am in or around the Pauline Johnson school in Toronto's east side, police spokeswoman Katrina Arrogante told AFP.
Khawlah Noman told reporters that she was walking to school with her younger brother when the man came at her with scissors.
Constable Jenifferjit Sidhu told a press conference that Noman had turned and confronted her assailant, making loud noises to scare him off and then she ran away with her little brother in tow.
The suspect is described as an Asian man in his 20s, medium build, 5-foot-8 to 6-foot, black hair, moustache, glasses, wearing a black hoodie and black trousers. Her and her brother chose to cross the road and walk with a bigger group of people.
"This school lives inclusiveness", she said. He wore glasses, a black hoodie and black trousers.
"No child should ever be afraid walking to school in Toronto because of what they are wearing or for any other reason", he said in a statement. "I want her and her family and her friends and community that that is not what Canada is and that is not who Canadians are". "For something to happen to one of our kids here, it's all the more piercing in the heart".
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The school has brought in social workers for the children to speak with, if they wish to do so.
"We want to make sure they know we're aware of what's happening, and we're available to talk", TDSB trustee Manna Wong said.
The alarming incident has reportedly increased pressure on the Canadian government to adopt further measures against persisting assaults on Muslims and Islamic places of worship across the North American country.
Here they were standing in front of the national media describing an alleged hate crime in Scarborough that shocked the country.
"Having the police recognize this as a potential hate crime is a much greater act of deterrence, and a signal that Islamaphobia will not be tolerated", said Mohammed Hashim, a member of the Urban Alliance on Race Relations.
Sidhu called the girl's actions "brave and smart". "We need to find ways to get communities to trust the criminal process, and report hate crimes". The blue hijab is now with police as evidence.
When asked what she would say to the suspect, Noman added: "What you're doing is way wrong".