A victim is taken away from the scene of the shooting in Chicago on Thursday night.

Updated – Sept. 23, 9:30 p.m. ET:

Thirteen people, including a 3-year-old boy, were injured Thursday, Sept. 19 when gunmen opened fire on people in a park on Chicago's South Side. The incident took place shortly after 10 p.m. in the city's Back of the Yards neighborhood.

According to a witness, dreadlocked men in a gray sedan opened fire from their vehicle before turning toward Cornell Square Park and continuing to shoot at random people in the park.

Two men, Bryon "Lord" Champ, 21, and Kewane Gatewood, 20, were charged Monday, Sept. 23 with three counts of attempted murder and three counts of aggravated battery with a firearm, the Chicago Sun-Times reported.

Eleven victims were taken away in ambulances while another person apparently drove himself to the hospital for treatment, the Chicago Tribune reported. One child, two teens, and 10 adults were among the wounded.

The 3-year-old boy, who was shot in the face, and two others, were in critical condition, Chicago Fire Department officials said. On Friday, Sept. 20, the Chicago Police Superintendent said that all injuries were non-life threatening.

"They hit the light pole next to me, but I ducked down and ran into the house," Julian Harris, 22, told the Sun-Times. "They've been coming 'round here looking for people to shoot every night — just gangbanging stuff. It's what they do."

The weapon used was an assault-style rifle with a high-capacity magazine. The shooting was allegedly gang-related and was revenge for a gang member who suffered a minor bullet wound several hours before the shooting occurred Thursday night.

The men were arrested Saturday night in an abandoned building in the 5200 block of South Marshfield nearby the Cornell Square Park, police said.

While the two men are believed to have played significant roles in the shooting, neither is believed to have pulled the trigger, said Chicago Police Superintendent Garry McCarthy.

Authorities are continuing the investigation, and believe as many as three people opened fire Thursday, Sept. 20.