Thirteen people were wounded in a shooting at a Chicago park on Thursday, in what was the second major gun-related incident of the week in the United States, coming just days after the D.C. Navy Yard massacre.

No arrests have been made and police believe that the shooting was likely gang-related.

Among the 13 people wounded included a 3-year-old boy; no one has died from their injuries but some still remain hospitalized in serious to critical condition.

According to Reuters, witnesses are telling different stories. One person said two gunmen walked up and started shooting at everyone, while another witness said that the criminals carried out the shooting from their vehicle.

Mayor Rahm Emanuel apparently canceled meetings in Washington so that he could fly back to Chicago to address the incident.

"Senseless and brazen acts of violence have no place in Chicago and betray all that we stand for," Emanuel said in a statement. "The perpetrators of this crime will be brought to justice and prosecuted to the full extent of the law."

Unfortunately, contrary to what Emanuel said, acts of violence have indeed had a place in Chicago, a city that has long had a reputation for violence.

Just days ago, the FBI released updated crime statistics indicating that Chicago now leads the nation's cities in murders, despite the fact that Chicago's population is merely a third of New York's.

New York previously held the number one spot but it also happens to be the largest city in the United States. The FBI also said that gun violence accounted for 500 murders in Chicago in 2012 alone.