Biden condemns US gun violence as an ‘international embarrassment’ as he announces new actions – as it happened

• President outlines steps he will take to end gun violence
• Actions include regulations on ghost guns' and pistols
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12.59am BST

- Joan E Greve and Maanvi Singh

12.44am BST

Six days before a man shot and killed 10 people, he legally purchased the military-style firearm he used for the crime. The incident - one of three recent mass shootings - yet again renewed a public debate about banning assault weapons in the US and seems like a potential example of a shooting in which an assault weapon ban might have been effective in reducing the death toll of the attack. But would it?

When firearms are recovered by law enforcement because of their use or suspected use in a crime, the weapons are recorded in a database along with the date of their first retail sale. The amount of time between those two events is known as the time to crime" and is published by the US Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). While the suspect involved in the Boulder shooting waited just six days, the national average time to crime is 8.3 years, according to 2019 statistics from the ATF.

Related: Can an assault weapons ban reduce killings if firearms last 100 years?