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'Incredible acts' from teachers 'saved lives'

Doctor Janet Robinson, Newtown Superintendent of Schools, says "incredible acts of heroism" by teachers saved many lives, even though so many lives were lost.

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The father of the 20-year-old US man who is thought to have killed 26 people including 20 young children, along with his own mother, has expressed his grief and shock over the massacre.

Peter Lanza is the father of Adam Lanza, who is thought to have taken his own life shortly after carrying out Friday's massacre in Newtown, Connecticut. On Saturday, he released a statement to WFSB television in Connecticut.

"Our hearts go out to the family and friends who lost loved ones and to all those who were injured. Our family is grieving along with all those who have been affected by this enormous tragedy," the statement said.

Anne Marie Murphy, aged 52. Click for more photos

Victims of the school shooting identified

Anne Marie Murphy, aged 52. Photo: Supplied

"No words can truly express how heartbroken we are. We are in a state of disbelief in trying to find whatever answers we can," it continued.

"We, too, are asking why. We have cooperated fully with law enforcement and will continue to do so. Like so many of you, we are saddened and struggling to make sense of what has transpired."

Peter Lanza was divorced from Adam's mother Nancy. Adam Lanza lived with his mother in Newtown, and she is thought to have been his first victim before he set off for the school.

The slain mother owned a registered collection of guns, including those used in the attack.

AFP