The incident happened on July 3 near 9th and Pine streets.
READ MORE | 13-year-old charged with attempted murder after firework explosion injures man in Wilmington
According to investigators, a man was sleeping on a porch stoop when a group of young teens repeatedly fired Roman candle fireworks at one another and at the man.
Police initially charged a 13-year-old boy with attempted murder.
Authorities have now announced charges against another 13-year-old boy and a 16-year-old boy. Both face attempted murder charges in connection with the incident.
The victim, a 31-year-old man, suffered critical injuries, police said.