Birmingham sisters murder: Man convicted of murder
"This man knew exactly what he was doing - so in control was he that, in the course of these attacks on these two girls, he broke off to rearm himself.
"He launched the attack with fists and maybe feet and then he got a knife and he used it and he broke it... and he went to get another knife and he broke it.
"He went and got a third knife and he used it until the girls were dead."
Describing Ali's claims of provocation as a last throw of the dice to avoid convictions for murder, Mr Crigman added: "Even if there was an element of provocation from either of the girls... no reasonable man would have reacted in the way that this man did."
Yasmine and Sabrina moved from Algeria to the UK in 1998, along with their parents and three brothers.
The family settled in Wembley, north west London.
Yasmine, a salsa dancer, moved to the West Midlands to study chemistry at the University of Birmingham.
After failing her exams she left and became a French and Arabic translator and later a sales administrator.
Sabrina moved to live with her sister not long before she was killed. She was due to study French at the same university as her sister.
The siblings shared the flat with a friend, who was away on holiday at the time of the killings.
The court heard that Yasmine met Ali in 2006 and became pregnant by him twice, resulting in two terminations.
Mr Crigman said their relationship had been "foundering" before the killings.
In a text message to Ali a few days before her death, Yasmine, who was a twin, wrote: "Actually let's call it a day like you mentioned. I am disappointed you think I am a slut.
"I am not willing to have you in my life if you do not respect who I am."
In another, she wrote: "You hurt me with your words. You cannot respect a woman can you?"
