Romero said the three men arrested last night and their getaway driver are also suspected in "five or six" other holdups, including one on Jan. 10 at the Kailey Market at 324 Prospect St.
Police said four armed men stormed into the store about 9:15 p.m. wearing Halloween masks, one of them a "Joker" mask.
A man in the store was knocked to the ground and shot in the leg.
Witnesses said one of the men carried a red golf bag with what appeared to be a shotgun sticking out of it; another had a rifle; and two had handguns.
Four shots were fired after they fled with an undisclosed amount of cash.
"This is a very active investigation, and these are dangerous people.," Romero said.