However, speaking anonymously on Monday, the neighbour said she called Greater Manchester Police about al-Shamie in 2021 but never heard back from the force.

The Times has also obtained video of al-Shamie outside the synagogue minutes before launching his attack. The surveillance camera footage shows him returning to the area in his car, driving at speed towards the gates guarding the congregation.

Friends of al-Shamie, who moved to Britain from Syria as a child and was granted UK citizenship in 2006, have said that he was a university dropout who smoked cannabis, played violent video games and spent much of his time in the gym.

A former teacher who taught al-Shamie for several years when he was a teenager said on Monday that he was a “strange” and “weird” pupil. Although he did not have many friends at school, the teacher said that he never displayed any extreme behaviour.

According to his neighbour, al-Shamie changed dramatically during the Covid pandemic, becoming a devout follower of Islam.

She said that a line was crossed when he began “preaching to two kids” in the street “as well about this Quran”, adding that she dialled 999 and “reported the house” to police.

“They didn’t come back to me. I remember making the call and speaking to Greater Manchester Police,” the neighbour added. “Even though I’d grown up with the family, I still reported it because it wasn’t right.”

Asked if she noticed a significant change with al-Shamie, she said: “Yeah. You could tell [his faith] was deep.”

According to al-Shamie’s former teacher, as a schoolboy he was repeatedly “sent to the quiet room” after arguments with his classmates

“He used to keep himself to himself. His language wasn’t that strong,” the teacher said. “He was a bit strange and didn’t have many friends. He was quiet, weird in a way.

“All the other kids would talk about football, cars, holiday, he wouldn’t. I didn’t pick anything extreme up though.

“During lunchtime other kids would play football and chat to each other, but he didn’t.”

The teacher added: “There was a little bit of trouble. We used to have a system called the quiet room when you’d be naughty and he’d have to spend all day in there. He was put there a few times for problems with other people.”

Al-Shamie was shot dead by police at the scene of the attack at Heaton Park Hebrew Congregation in Crumpsall.

A funeral was held on Monday for Adrian Daulby, 53, who is believed to have been inadvertently shot by police as they tried to stop the attacker from entering the synagogue.

Mourners were told he was a quiet man who “became a tremendously strong hero” during his community’s moment of need.

Rabbi Daniel Walker said Daulby “didn’t run away from danger”, but leaped from his seat to block the doors of the synagogue as al-Shamie tried to get in to attack worshippers.

Describing Daulby as a “great martyr”, Walker said: “Adrian sits on the back row of the shul [synagogue]. When evil struck, he sought to secure the building. All of you who know and love Adrian know he was a quiet man. In that moment of need, that quiet man became a tremendously strong hero.”

Walker said that the synagogue had been “frozen in time” since the attack, with Daulby’s prayer book still open on the page at the time al-Shamie struck. His niece clutched the tanakh, the Hebrew Bible, to her chest outside Agecroft Jewish Cemetery.

Another niece said: “Our tradition teaches us, to save a single life is to save the world. Adrian did just that.”

Sharon Baum, 53, who had been friends with the “friendly” and “unassuming” Daulby since they were children, said: “If you had gone up to him in school and said ‘you’re going to be a hero in 40 years’, he would have said ‘no way’.”