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'Killing a child would be little more than a trophy': As America sees the worst spree killing in its history, an expert explains the chilling psychology behind spree killers 

• Gunman Adam Lanza believed to have killed 29 people - including 22 children - at Sandy Hook Elementary School in Newtown, Connecticut, today
• Head of psychology at Birmingham City University Professor Craig Jackson describes what may have been going through the killer's mind

The killer behind the horrific elementary school spree killing would have seen the children he shot dead as ‘little more than trophies’, an expert psychologist has said.
A lone gunman – believed to be 20-year-old Adam Lanza - opened fire at around 9.30am this morning at Sandy Hook Elementary School in Newtown, Connecticut.  It is understood at least 29 people have been killed – including 22 children - and is the worst spree shooting in American history.
Professor Craig Jackson, head of psychology at Birmingham City University and an expert in spree killings, said the murderer would have seen killing the children as a way of enacting revenge on those he was angry with.

Shocking news: At least 29 people are believed to be dead - including 22 children - after a gunman opened fire today at an elementary school in Connecticut

Tragedy: A woman leans on a man as she weeps outside a building set up to counsel family members affected by a shooting nearby at Sandy Hook Elementary School

‘To him the children are just a lump of meat that happen to help him prove his point,’ he explained.
‘If this was a revenge spree then he would see the children as useful trophies because each death would injure those he wanted to hurt.

 ‘This was the case in the Dunblane school massacre. Thomas Hamilton had no connection to the school but saw the killing of the children as a way to punish the community as a whole.’

It is understood Lanza killed his father before heading to the elementary school where he killed the head teacher before targeting a class his mother taught.

Expert opinion: Professor Craig Jackson is the head of psychology at Birmingham City University and specialises in spree killings

Professor Jackson said: ‘It is possible that this spree stemmed from a domestic row and once he had killed his father he decided to continue shooting.
'As he had already killed one person, he may have seen to keep on going as the only option.
‘But then the main question is, why shoot the children? There must have been a motive for that. He must have felt he had a grievance with the community that he wanted to punish.
‘Many spree killers target children as a way to get even with the local community.
‘I’m sure many survivors will report that he was calm and focused.  These sort of killers aren’t crazed, they know what they are doing and choose who they kill.
‘The Columbine High School massacre is an example of this, where the killers let some people go but shot others dead.
'This makes them feel powerful and in control.’ 
Professor Jackson explained that all spree killers have certain things in common – they are unstable, narcissistic, immature and consistently blame others for their failures.
He continued: ‘They often believe they should be doing better in life than they are doing and believe it is others’ fault that they are not.
‘They may believe teachers held them back, or blame their parents, but it is never their fault.
‘This outlook builds throughout their lives and then it comes to a point that something tips them over the edge.’
He said the killing of his parents points to trouble at home but the thing that sent the killer over the edge could also be down to problems at work or university.
The Batman killer James Holmes had been kicked out of his university for failing his exams shortly before his shooting rampage at the midnight screening of the Dark Knight Rises in Aurora, Colorado, on July 20.

Stunned: People leave the scene outside the Sandy Hook Elementary School following a shooting inside the school in Newtown, Connecticut