The 21-year-old suspect in the July Fourth parade mass shooting in Highland Park, Illinois, was charged Tuesday with seven counts of first-degree murder.

Seven people were killed and at least 38 people were injured when the suspect, Robert "Bobby" Crimo III, allegedly opened fire on marchers and revelers, according to police. Eric Rinehart, the Lake County State Attorney, told reporters he will request a judge to hold the alleged gunman while the investigation continues.

If convicted, the suspect faces up to life in prison without parole.

"I want to emphasize that there will be more charges. We anticipate dozens of more charges centering around each of the victims, psychological victims, [and] physical victims," Rinehart said.