A 19-year-old man arrested earlier this week and tied to three armed robberies in Roosevelt and Hempstead has been charged with five additional robberies at Nassau convenience stores, police said.

Keith Q. Estrada, of 98 Park Ave., Roosevelt, was ordered held on $100,000 bond or $100,000 cash bail after his arraignment on the additional counts Wednesday, Nassau County police said. Unable to post bond or bail, Estrada is being held in the Nassau County jail and is scheduled to return to court Friday, records indicate.

It was not immediately clear if Estrada entered a plea at his court appearance or if he was represented by counsel.

Police said Estrada was arrested on Nassau Road in Roosevelt at 4:43 p.m. Monday, while carrying a large black BB gun and marijuana.

Detectives then tied Estrada to three armed robberies and he was charged with three counts of first-degree robbery, three counts of criminal possession of a weapon and one count of unlawful possession of marijuana, police said. On Wednesday, police said Estrada was charged with an additional five counts of first-degree robbery, as well as five counts of second-degree robbery.

Those robberies occurred Jan. 7 at a 7-Eleven on Merrick Road in East Meadow; Jan. 9 at a 7-Eleven on Elmont Road in Elmont; Jan. 18 at a 7-Eleven on Merrick Road in Baldwin; Feb. 3 at a USA gas station food mart on West Centennial Avenue in Roosevelt; and Feb. 5 at a 7-Eleven on Brooklyn Avenue in Freeport.

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Binghamton man, identified by police as Tyree Willis, 32, was arrested after the Freeport robbery and charged with three counts of first-degree robbery, two counts of second-degree robbery anda parole violation. The status of those cases was not immediately known.

Police said Estrada had an accomplice in at least six of the robberies. Willis was charged in the Freeport robbery and the East Meadow robbery on Jan. 7. It was not immediately clear if police believe he is tied to the other cases -- or if detectives are searching for another accomplice in those cases.

In addition to Estrada and Willis, police said there was a third man, who is still being sought.

The initial three cases tied to Estrada involved the robbery of a 74-year-old man in his car on East Roosevelt Avenue at 4:41 p.m. March 30, the robbery of a Metro PCS store on Nassau Road at 8:20 p.m. March 31, and the robbery of a 7-Eleven store on Fulton Avenue in Hempstead at 3:25 a.m. on April 3. In all three cases, police said, Estrada displayed "a large black handgun" police now believe is the BB gun.

No one was injured in any of the robberies, police said.

Police did not say if officers were attempting to locate Estrada in connection with the robberies when he was arrested on Monday or if he was arrested after a routine stop.