New York (CNN) -- A New York City man was indicted Tuesday on six murder counts, accused of using a .22-caliber rifle to kill three city shopkeepers.
Salvatore E. Perrone, 64, could face up to life in prison if he is convicted, authorities said.
Detectives recovered a duffel bag from the house of Perrone's girlfriend on Wednesday morning and found the carbine with a sawed-off stock and a combination laser/flashlight attached to its barrel with duct tape and two thick, pink rubber bands.
They also recovered a box of .22-caliber long-rifle ammunition, an empty magazine and a 12-inch kitchen knife with dried blood on it as well as two Buck folding knives, each with 7-inch blades.
Police said the .22-caliber rifle was used to kill Vahidipour Rahmatollah, 78, at his She-She boutique on November 16; Isaac Kadare, 59, at Amazing 99-Cent Deals on August 2; and Mohamed Gebeli, 65, on July 6 at Valentino Fashion in Brooklyn.
Police Commissioner Raymond Kelly didn't provide a motive for the killings.
"I think it's reasonable to assume that he was going to continue doing this, and by arresting him, we have saved lives," said Kelly. Perrone's attorney could not be reached for comment.
Perrone was an independent seller of men's and women's clothing to boutiques in Brooklyn, Kelly said.
"After his photograph was circulated, we received several calls from proprietors of similar stores to inform us that they recognized Perrone as a salesman who would periodically visit their stores," he said.
Perrone was spotted at a pharmacy in Brooklyn on Tuesday evening and voluntarily agreed to come to the precinct.
In 2001, Perrone was also arrested in Franconia Township, Pennsylvania, on a forcible entry charge.
He has a house on Staten Island but has been residing with his girlfriend in Brooklyn for the past several years, police said.