The student gunman from yesterday's Colorado high school shooting was armed with a shotgun and ammunition he bought legally this month, the county sheriff told Reuters.
The sheriff added that the gunman at Arapahoe High School was also carrying a machete and a rucksack with three Molotov cocktails.
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She told reporters: "I don't think it's fully sunk in how really bad that could have been, I know it's not the right decision."
Jonathan Theobald said: "The weather can change quickly and a car can become lethal, I've discovered that the hard way."
Political parties across the country suspended their General Election campaigns following the Manchester Arena terror attack on Monday.