(Chicago, IL) – Over 100 people were arrested during an outbreak of violence in Chicago overnight.

13 police officers were also hurt. This happened during a night of looting and other unrest in the downtown.

Authorities say the violence stems from the shooting of a person by police the previous day. 

The violence overnight included shots fired at police and officers returning fire. Chicago mayor Lori Lightfoot says a neighborhood protection program has been activated and will be in place for the foreseeable future.