The inquiry later heard from the killer’s father Alphonse Rudakubana, who was asked about what information he shared with different agencies about his son’s “destructive” behaviour at home.
On several occasions Rudakubana had made outbursts in which he threatened to kill his father, the inquiry heard.
Nicholas Moss KC, counsel to the inquiry read from a statement given to the inquiry by Mr Rudakubana, which told how his son’s “attitude and behaviour at home can be very frightening”.
Around this time, his father remembered how his son had “poured a significant quantity of oil” over his head and threatened to kill him “in very menacing terms”.
Mr Moss asked what he meant by menacing terms.
Mr Rudakubana said his son had appeared to be in some kind of “mental pain” beforehand.
He said: “He came in front of me, he was poking me in my chest, saying if you get me out of here, in this house, it may take a week, it may be a month, maybe years, but trust me I will kill you.”
He said the reference to leaving the house was from a comment around a week earlier when he had suggested that in the future his son would have to live in a separate house.
Mr Moss reads from Mr Rudakubana’s statement, which said he and his wife were “very scared” of his son.
Mr Rudukabana also said the family “felt kind of lonely” after settling in the UK following the Rwandan genocide of the 1990s.
He said: “We made a decision to wait until they grow up and understand and be less affected. I was surprised – they came home and were talking about the genocide in Rwanda both of them, they were learning about it in school.
“We then told them a few things we thought they can handle.”
He said he did not believe this discussion affected his family life in the UK.
“I think what affected them was that we were a small family with two friends from Rwanda [in the UK],” he said.
“They could see that we are kind of lonely compared to their peers, their friends from school. So they’ll see that we are in a foreign land even thought they were born here.”