It happened near a university apartment complex known as Courtyards on September 7 just after 10:30 p.m.
Officers said they responded to the apartments for reports of a shooting. At the scene, several vehicles and buildings had been shot at.
No injuries were reported, investigators say.
Authorities later identified Tyrone Harrell, 18, and a 15-year-old male, both from Dover, as the alleged shooters in this incident.
Harrell was a registered student at Delaware State University but has since been expelled, according to police.
The 15-year-old has no known connection with the university.
Harrell was arrested on September 9 without incident, according to police.
Police say the 15-year-old was taken into custody on September 20.
Authorities reportedly found a polymer 80 .40 caliber handgun with a loaded 30-round magazine at that time.
Both suspects were charged with possession of a firearm during the commission of a felony, reckless endangerment, and other related offenses.