Governor: Lanza's weapons choice shows ban is vital

Adam Lanza shot dead 20 pupils and six staff members at Sandy Hook Elementary School in a matter of minutes. Credit: REUTERS/Lucas Jackson

Newtown killer Adam Lanza's choice of assault weapons from his store of guns to carry out the December school massacre underlines why tighter controls are needed, Connecticut Governor Dannel Malloy has said.

"We now know that he left the lower capacity magazines at home," Malloy said in a statement after the previously sealed searches of Lanza's car and home were made public.

"This is exactly why we need to ban high capacity magazines and why we need to tighten our assault weapons ban."

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Massacre gunman's arms haul

The gunman who killed 26 people, including 20 children, in a shooting spree in a US elementary school fired 155 bullets in less than five minutes. Court papers released reveal he also had several additional firearms not used in the attack.