A barbecue at a South Side park was interrupted by gunfire early Tuesday, leaving Antian Hardmon, Ayanna Northern, and Tyrone Spikes dead, and three other people injured in the Fuller Park neighborhood.About 30 people were enjoying the barbecue, a memorial for someone who died in a crash years ago, when more than 15 shots rang out, according to a woman who wished to be identified only as “Shorty.”Five people were shot about 12:10 a.m. in the 300 block of West 42nd Street when two males opened fire from an alley, according to Chicago Police. Lawn chairs and beer cans could...