Canadian investigators are examining whether online extremism played a role in a mass shooting that left eight people dead in British Columbia, after researchers reported that the teenage suspect circulated antisemitic and violent content online shortly before the attack.

The 18-year-old school shooter who killed six people, two family members and died of a self-inflicted wound in Canada on Tuesday wrote on social media two days before the attack, “I need to hate Jews.”

Prior to the shooting at Tumbler Ridge Secondary School which claimed the lives of a 39-year-old teacher, five students aged 12 and 13, in addition to the suspect’s mother, and his 11-year-old stepbrother at home, he wrote online, “I need to hate jews because the zionists want me to hate jews. This benefits them, somehow,” the ADL reports.