The shooting occurred just after 2:30 a.m. on Aug. 15 as police officers Christopher Kayser and Jeffrey Shifler were on routine patrol in the 400 block of North Potomac Street.
The officers were behind a car traveling south when it pulled to the west side of North Potomac Street, and Kayser saw a handgun being pointed from the passenger side of the car, police said.
Kayser then heard about six shots being fired and saw the muzzle flash from the weapon, police said.
The brown Oldsmobile, which was reported stolen later that morning, continued south on Potomac Street before stopping briefly at West Franklin Street, where two men got out of the back seat and fled on foot.
When police attempted to stop the car, it continued on West Franklin Street before striking a curb at the corner of West Franklin and High streets, where the driver and passenger got out and fled on foot.
Moore, who was arrested later that day, was identified as the passenger who fled when the car hit the curb, police said.
Arrested three days later was Michael Wayne Bernhisel Jr., 24, of Hagerstown, who also was indicted in the shootings.
His court appearance is scheduled for Monday, March 10.
A third man, Donnie "Buggsy" Caldwell, 18, of 1024B Noland Drive, is being held without bond awaiting trial at the end of March, court records said.
Both face numerous charges of reckless endangerment, assault, assault with intent to murder and conspiracy to commit murder, according to Washington County Circuit Court files.
Police said Thursday that more arrests are expected. No one was injured in the shootings.