FORT BEND COUNTY, Texas — Authorities on Thursday identified the two suspects killed and two others arrested after a robbery investigation that led to a chase and shootout in Cinco Ranch.

The robbery happened at the Walgreens on Westheimer Parkway and South Mason Road just before 11 p.m. Tuesday.

RELATED: 2 'violent' robbery suspects killed in Cinco Ranch shootout

Christopher Brimsey, 20, died at the scene, and Patrick Reed, 19, died at the hospital, according to DPS officials.

Joshua Prater Jr., 21, and Dametric M. Hunter, 21, are charged with aggravated robbery and were booked in the Fort Bend County Jail.

DPS Troopers opened fire on the suspects, who are believed to be responsible for at least eight "violent" robberies over the last couple weeks in Fort Bend and Harris counties.

Investigators said the robberies happened at pharmacies from Katy to Cypress and Spring. They said the suspects were after cash -- not drugs -- and the similar layout of the stores made it easy to carry out the robberies quickly.

Officials said that task force had been gathering intelligence on the crew for two weeks and had recently gotten information on their vehicle.

Houston Police are also speaking with investigators to see if the same suspects could be linked to robberies in the city.