Prosecutors file new charges against accused Boulder, Colo., shooter

May 25 (UPI) -- The Boulder County District Attorney's Office has filed dozens of additional charges against the 21-year-old man accused of killing 10 people during a shooting at a Colorado grocery in March.

The office on Monday announced more than 50 sentence enhancers and 14 new attempted murder charges against Ahmad Al Aliwi Alissa, for a total of 115 charges stemming from March's mass shooting at a King Soopers grocery store in Boulder that left 10 people dead, including a police officer.

Alissa was originally charged with 10 counts of first-degree murder and one count of attempted murder, but an additional 33 counts of attempted first-degree murder and 10 weapons charges were added for a total of 54 charges last month.

"Based on developments in the ongoing investigation, the district attorney's office has determined that additional crimes and sentence enhancers must be charted in this matter," the office said in a statement. "With these additions, the allegations now include a total of ten murder victims, fifteen civilian victims of attempted murder and eleven victims of attempted murder who are members of law enforcement."

The shooting began at around 2:40 p.m. on March 22 with officers dispatched to the grocery store following calls that a man with a AR-15 rifle had opened fire, prosecutors said.

Police arrived and exchanged fire with the gunman, taking Alissa into custody at about 3:28 p.m. The suspect surrendered to police after suffering a gunshot wound to the leg and was in possession of a green tactical vest, a rifle and a semiautomatic handgun.

The charges were filed ahead of a hearing on Tuesday at 8:15 a.m. before Chief Judge Ingrid Bakk to determine next steps in the case.