For roughly a month, armed robberies and carjackings have plagued east Atlanta residents in DeKalb County.

But “patterned behavior” led Atlanta and DeKalb police to suspects connected to the crime spree.

Police first arrested two people connected to armed robberies in March, all within a mile of each other, Atlanta police spokesman John Sells said in a news release.

Police said Daquan Cosby, 19, and an unnamed juvenile robbed four people on separate occasions with a handgun and long rifle and took their wallets, keys and cellphones. The suspects, police said, also demanded the victims’ bank cards and pin numbers, which they later used at ATMs.

Cosby and the juvenile were arrested March 22 after officers noticed a maroon Nissan Altima that was used in an armed robbery on Stokeswood Avenue. A pistol, a mask, a marijuana drug scale and what is believed to be a “long gun” were found in the car.

Cosby was booked into the DeKalb County jail on armed robbery charges. He also faces drug and traffic charges in Fulton County and admitted to a Union City robbery that happened in February, police said.

A week later, police arrested a 15-year-old connected to five carjackings.

DeKalb police say between March 22 and March 25, the teen, who was not identified, went on a carjacking spree and stole $50,000 worth of cars. According to the police report, the suspect pulled two kitchen knives on the victim and demanded his car keys as he pulled up to his house.

On March 27, police said the teen, armed with a knife, followed a woman to her Memorial Drive home and demanded her car and keys. The alleged victim ran inside, hid in a room and screamed for a friend, Sells said. The suspect took off without anything, thinking that the friend was in the house.

He was arrested March 28.

A third juvenile was arrested March 29 when cops spotted him driving a stolen 2016 Dodge Charger.

Most recently, DeKalb police arrested a couple in connection with a April 1 robbery on Hillside Avenue in which they allegedly demanded a woman’s keys and money. Police arrested 23-year-olds Richard Davis Jr. and Shenica Timmons shortly after the theft when a police dog sniffed them out of an abandoned house.

Cosby, Davis and Timmons remained in the DeKalb County jail Tuesday.

In other news:

Authorities will resume the search at 9 a.m. Tuesday.