At least one person was shot Sunday evening outside the Hawthorne Race Course in the southwest suburbs.
At about 8:30 p.m., gunfire erupted in a Belize-themed festival that was happening outside the race track. About 2,000 people were attended the annual cultural festival.
Another 1,000 people were inside the race track in Stickney, where a race was temporarily suspended.
Hawthorne general manager Jim Miller said the horses were herded off the track, but the race was resumed after about an hour.
Miller said the Belize-themed festival is a yearly event, which has not had problems in the past.