Alder Hey NHS Trust said Axel Rudakubana stopped engaging with the service in February 2023.
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Axel Rudakubana was first referred to Alder Hey's mental health services after taking a knife to Range High School in Formby and later saying that he had done so "to use it".
He was also referred to the counter-extremism programme Prevent because he had been researching school massacres on a computer at his next school, The Acorns.
There were two other referrals to Prevent, but none of them were progressed as Rudakubana had no clear ideology behind his obsession with violence.
Lancashire Police also had several interactions with Rudakubana, including one occasion in March 2022 when he was found on a bus with a knife.
His mother had also been warned to secure the knives in their house.