The Chicago Police Department announced on Tuesday, September 24 that four people where charged in connection with a shooting the previous week in Chicago's Back of the Yards neighborhood. The shooting injured 13 people, including a 3-year-old boy. All four were charged with three counts of attempted murder and aggravated battery with a firearm. 
Tabari Young, 22, is the person who police say fired a military-grade weapon during the shooting. His record includes more than a dozen arrests. 
Bryon Champ, 21, also fired a gun during the shooting, according to police. Police also say he is a convicted felon and known gang member. 
Kewane Gatewood, 20, is the man who police believe supplied the weapon used in the shooting. 
Brad Jett, 22, is a convicted felon who police say acted as a lookout during the shooting. - NEW: Four arrests are made, including two alleged shooters
- NEW: All charged with attempted murder and aggravated battery with firearm
- 13 people, including a 3-year-old, were shot and injured on Chicago's south side
- Grandmother: "Y'all out here killing these innocent people ... you need to stop."
(CNN) -- Police have arrested four men in connection with a Chicago shooting that wounded 13 people, including a 3-year-old boy, authorities said Tuesday.
Two of the four suspects -- Tabari Young, 22, and Bryon Champ, 21 -- fired shots in the incident, Chicago police said.
All four have been charged with attempted murder and aggravated battery with a firearm, police said.
Young is accused of firing an assault-style rifle used in the shooting. Police say Champ also fired a gun during the incident.
A third suspect, Kewane Gatewood, 20, is accused of supplying the assault weapon, and Brad Jeff, 22, was allegedly the lookout during the shooting, police said.
"Our officers and our detectives have worked tirelessly in partnership with the community, to solve this case and hold the criminals who committed this senseless act of violence responsible for their actions," Chicago Police Superintendent Garry F. McCarthy said in a statement.
In all, 13 people were shot Thursday at the Back of the Yards neighborhood on Chicago's South Side.
The shooting victims included 3-year-old Deonta Howard and two 15-year-olds. All the victims survived.
'It's got to stop,' Grandmother says after 3-year-old shot in Chicago
Grandmother's plea: Stop the killing 
Chicago gangs hold peace tournament 
Chicago boy to survive after surgeries 
Once again, Chicago is in the spotlight over gun violence after an overnight shooting on Thursday, September 19, that injured 13 people, including 3-year-old Deonta Howard. Police are calling the shooting gang-related. 
A woman is overcome with emotion near the scene of the shooting at Cornell Square Park in Chicago's Back of the Yard neighborhood on September 19. 
The Chicago Fire Department hoses down the scene where the shooting occurred. 
Neighbors watch the scene where 13 people were shot at Cornell Square Park. 
Emergency personnel transport victims from the scene of the shooting on September 19. 
Deputy District Fire Chief James Mungovan updates the media after the shooting at Cornell Square Park on September 19. Shooting in Chicago Deonta's grandmother made a plea to those fueling violence in Chicago.
"Y'all out here killing these innocent people, kids, parents, grandparents, mothers, fathers: It's got to stop. You need to stop," Semehca Nunn said.
An assault-style rifle with a high-capacity magazine was used in the shooting, which appears to be gang-related, McCarthy has said. One of the alleged shooters, Champ, is a documented gang member, police said.
Chicago bans some semiautomatic weapons and high-capacity magazines and restricts handguns.
The FBI's annual crime report last week showed Chicago had 500 homicides in 2012, up from 431 in 2011 and more than any other American city. Chicago officials have said homicides this year are below the 2012 pace.
Still, Chicago does not have the highest homicide rate in the United States. That distinction belongs to Flint, Michigan, with one homicide for every 1,613 residents, according to the FBI data. Detroit is close behind, with one killing for every 1,832 residents.
In 2012, the number of violent crimes increased by 0.7%, compared with the previous year, according to the FBI figures.
For Chicago, 7 weekend homicides represent progress
CNN's Mariano Castillo and David Simpson contributed to this report.
