The 17-year-old boy is accused of fatally stabbing a woman in February.

Incel, short for "involuntarily celibate," is an online subculture focused on members' perceived inability to find romantic or sexual partners.

A 2018 attack in Toronto that killed 10 was also allegedly inspired by the ideology, but the accused in that case was not charged with terrorism.

On Tuesday, Toronto Police and the Royal Canadian Mounted Police (RCMP) held a news conference announcing the terrorism charges.

The suspect, who cannot be named because he is a minor, had already been charged with murder shortly after the incident, which took place at an erotic massage parlour.

Police allege he fatally stabbed Ashley Noelle Arzaga, 24, who was discovered inside the building around 13:00 local time on 24 February. Two other people, a man and a woman, were found outside the premises with stab wounds.

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