The Carson City Sheriff's Office has four people in custody accused being involved in the robbery a 99-year-old woman earlier this month.
Deputies arrested 37-year-old Victoria Julia Mora, 22-year-old Gloria Grajeda and 30-year-old Bexy Barbara Mora on Tuesday after getting a report of stolen property at a home in Carson City.
They arrested a fourth woman - 21-year-old Joanna Krystal Grajeda on Thursday.
Investigators say Moras and Joanna Grajeda targeted the 99-year-old victim, identified as Tory Radford and took her purse which contained over $300 on Spear Street in Carson City back on December 4th.
The three are charged with conspiracy to commit robbery and robbery against a person over the age of 60.
Gloria Grajeda is charged with possession of stolen property.
The sheriff's office believes the women may have targeted other seniors as well.
Bail was set at $40,000 each.
Radford was not hurt.
