A federal lawsuit filed Thursday alleges a Chicago police officer shot a fleeing 13-year-old carjacking suspect in the back even as the city has tried and failed to implement a new policy on foot pursuits.

Gov. J.B. Pritzker signs legislation targeting ghost guns, the often untraceable weapons that police say are increasingly being found in the hands of criminals.

Chicago police Superintendent David Brown said at a news conference Tuesday that while it’s not illegal for youths to gather downtown, officers are prepared to take action if they break the law.

Watch as Chicago Police Superintendent David Brown speaks to the media, after a teen was killed at a shooting near The Bean over the weekend.

After nearly four years, Chicago finally has a new permanent U.S. marshal.