“It was our distinct honor to use Officer Eric Talley’s handcuffs to formally process" Ahmad Al Aliwi Alissa into jail, Boulder police said in a statement.
More than 500 people bundled in winter jackets attended a downtown Boulder candlelight vigil to mourn the 10 people gunned down at a supermarket.
The incident came just days after 10 people were killed in a mass shooting at a supermarket in Boulder, Colorado.
Ahmad Al Aliwi Alissa bought the weapon on March 16, just six days before the attack at a King Soopers store in Boulder.
Ten people between the ages of 20 and 65 were killed during a shooting at a King Soopers grocery store in Boulder, Colorado.
Ten people, including a police officer, were killed when a gunman opened fire at a King Soopers store in Colorado on Monday.
The father of seven, a Boulder officer since 2010, was the first to respond to reports of gunfire at the mass shooting scene.
"This may be the worst ever 'thoughts and prayers' message in the aftermath of a mass shooting," one Twitter user hit back at the pro-gun Colorado Republican.
"This feels like the safest spot in America and I just nearly got killed for getting a soda, you know, and a bag of chips."
Ahmad Al Aliwi Alissa, 21, is accused of fatally shooting 10 people, including a police officer, at a King Soopers store in Boulder.