Gang violence returned to Chicago when a gunman with an assault weapon opened fire in a park, leaving 13 people wounded including a 3-year-old boy who was shot in the face.

Given the nature of the weapon, a 7.65 rifle with a high-capacity magazine, it is "a miracle there were no fatalities," Chicago Police Superintendent Garry McCarthy said Friday.

The superintendent said that following Thursday night's incident in Cornell Square Park, several suspects are being interrogated, while District 20 Alderman Willy Cochran told the media that police have detained at least one person.

McCarthy said that police believe the shooting was sparked by tensions between two gangs, the Black P. Stones and the Gangster Disciples.

The youngest victim, 3-year-old Deonta Howard, was hit by a bullet that went through his cheeks and on Friday underwent plastic surgery at Mount Sinai Hospital.

The Rev. Corey Brooks announced on behalf of the family that the little boy was in critical but stable condition.

Street violence has skyrocketed in the city due to conflicts between gangs in public places, taking innocent victims in the crossfire.

Last year in Chicago there were 535 homicides, while so far in 2013 there have been more than 300 violent deaths.

Police say that up to 80 percent of murders committed in Chicago can be attributed to the approximately 600 gangs fighting among themselves. EFE