Randy Summerville, 31, and Roy Garrett, 21, are each charged with two counts of first-degree robbery, two counts of second-degree robbery and first-degree attempted robbery, police said.
Summerville, of 106 Linden Ave., also is charged with first-degree criminal use of a firearm, third-degree criminal possession of a weapon, second-degree menacing and violation of parole.
A police spokesman said Wednesday he did not know the specifics of Summerville's parole violation charge.
Summerville is scheduled to be arraigned Wednesday in First District Court in Hempstead.
Garrett, of 252 Lawrence St., was arraigned Tuesday and is being held on $50,000 bail, cash or bond.
Third Squad detectives said the two men were in the parking lot of the Costco on Old Country Road at about 11:30 a.m. when Summerville, showing a silver handgun, pushed a woman, 53, into her car and took a pocketbook from the front seat.
He attempted to take a second pocketbook from the vehicle but was unsuccessful, police said.
Summerville then fled and encountered a second woman, 63, and pointed his gun at her, police said. He ordered the woman to put her pocketbook on the ground, took the pocketbook and fled to a Ford Explorer that Garrett was driving, police said.
The two then drove to The Source Mall on Old Country Road, where a Third Precinct officer saw them later, inside the mall. The officer stopped the two men, but Summerville fled on foot.
Garrett was arrested in the mall, police said, and Summerville was arrested the next day at his home with assistance from detectives from the Hempstead Village Police Department, according to a news release.
Police said they also recovered a .380-caliber pistol when Summerville was arrested.