The Boulder, Colorado mass shooting suspect has been charged with 10 counts of first-degree murder, Boulder Police announced on Tuesday (March 23). Police identified the suspect as 21-year-old Ahmad Al Aliwi Alissa from the Denver suburb of Arvada. The suspect is accused of opening fire at the King Soopers supermarket on Monday evening (March 22), killing 10 people, including a police officer.

Police took Alissa into custody on Monday night. He received medical treatment for a leg wound and is currently in a stable condition at the hospital. Police say he’s expected to be released from the hospital and transported to the Boulder County Jail later today.

The 10 shooting victims were also identified on Tuesday and range in ages from 20 to 65 years old, Boulder Police Chief Maris Herold said.

“We are going to do everything in our power to make sure this suspect has a thorough trial and a thorough investigation will be done,” she said during Tuesday’s press conference.

As far as a motive for the shooting, District Attorney Michael Dougherty said, “We don’t have an answer to that yet. The investigation is in the very early stages and investigators are working hard to determine that. That information will come.”

Police have also not identified the weapon used in the attack, though they said they were alerted “about a possible person with a patrol rifle.”

On Tuesday, residents and police also honored slain 51-year-old officer Eric Talley, who was with the department for over 10 years. Talley was the first officer to respond to the scene of the shooting.

The tragedy arrives less than a week after shootings at three Atlanta-area spas that left eight people dead. According to CNN, this past week the U.S. has seen at least seven shootings in which four or more people were injured or killed.