© Provided by The Independent Police have revealed the gunman suspected of killing 10 people in a mass shooting on Monday in a Boulder, Colorado supermarket bought his weapon six days prior, as authorities race to find out more and president Biden pushes for stricter gun control in the wake of the killings.
According to an affidavit released on Tuesday, suspect Ahmad Al Aliwi Alissa used an AR-15 rifle, a semiautomatic, military-grade weapon common in mass shootings.
The court document did not describe where the gun itself was purchased, according to the AP, which first reported it.
Following news of the shooting, top Democrats like Joe Biden and former president Obama have renewed their push for more gun control regulations. The issue was a major focus of their time together in the White House, which generated a number of executive actions but failed to achieve the deeper overhaul of gun-ownership in the US both were seeking.
"This is not and should not be a partisan issue. This is an American issue," Mr Biden said on Tuesday, throwing his weight behind two bills that recently passed the House of Representatives which would expand universal background checks to cover private gun sales, and calling for a renewed ban on "assault weapons," which were outlawed prior to 2004.
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"We can ban assault weapons and high capacity magazines in this country once again," he said. "I got that done when I was a senator. It passed. It was law for the longest time and brought down these mass killings. We should do it again," he added.
Mr Biden's former Oval Office colleague Barack Obama singled out those in opposition to more gun control, who have largely been Republicans, as cowards.
"We can overcome opposition by cowardly politicians and the pressure of a gun lobby that opposes any limit on the ability of anyone to assemble an arsenal," he said in a statement on Tuesday. "We can, and we must."
In many of the deadliest shootings in US history, the perpetrator used an assault rifle of some kind, including the killings in Sandy Hook, San Bernardino, Columbine, Las Vegas, and Parkland.