Chicago Party Attack - About two dozen people - most them children - were injured Saturday night while a family gathered for a celebration on Chicago's Southwest Side, authorities said.

In the Chicago party attack case, the police responded outside a Gage Park neighborhood backyard paty about 11 p.m. in the 5000 block of South Rockwell Avenue, after someone sprayed a mace-like substance (pepper spray) into the yard from a nearby alley, causing skin irritations among victims, NBC Chicago reported.

The family is said to have gathered together to celebrate a couple's 50th wedding anniversary, however, the Chicago party attack had interrupted what should have been a joyous celebration, leaving members with skin allergies.

The husband and wife reportedly sat concerned at their front yard as ambulances rounded up the block, some of them accommodated three to four children, who were all treated for skin wounds and were eventually released overnight from hospitals that included: Little Company of Mary Hospital, Holy Cross Hospital, Mount Sinai Hospital, Saint Anthony Hospital and John H. Stroger, Jr. Hospital of Cook County.

The couple had been celebrating fifty years of marriage at a blue, two-story frame home in a Gage Park community on Rockwell Street just north of 51st Street.

Officials from the Chicago Fire Department said that the spray wasn't immediately identified, although it was clearly a "foreign substance."

Larry Langford, a spokesman for the city's Fire Department, addressed the Chicago party attack incident saying, 23 people, many of them children, suffered mild injuries from the assault, although there was no respiratory stress. He added that the victims were likely to be released soon from the hospitals they were sent to, according to the Chicago Tribune.

Chicago Police News Affairs Officer Amina Greer, said that the victims were treated and eventually released from different area hospitals. She also added that the suspect was not identified by the victims, and nobody was able to give a description of what he or she looks like.

A family relative present at the scene said they have no idea why someone would spray during the celebrating causing the Chicago party attack.