SMYRNA, Ga. -- Cobb County police are investigating a robbery at a Firehouse Subs restaurant in Smyrna.

The robbery happened at around 7:30 p.m. Monday at the location in the 4600 block of Camp Highland Road.

Cobb County police spokesman Mike Bowman said the suspect entered the restaurant and demanded money from the register. He ran after receiving cash.

Witnesses described the suspect as a white man, about 6 feet tall and 200 pounds. He was wearing black sweatpants, a black hooded sweatshirt and a red bandana that covered his face. He was also armed with a knife.

Anyone with information in this case is asked to call Cobb County police at 770-499-3945.

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COBB COUNTY, Ga. -- Three men were found guilty last week of shooting a victim to death and dumping his body in Cobb County.

Jurors deliberated five hours before convicting 27-year-old Harvey "Rucks" Hogans of New York, 32-year-old Derek Lee Kemp of Marietta and 31-year-old Alphonso "JRock" Watkins of Marietta of a number of charges.

The defendants were sentenced Monday to life in prison without the possibility of parole. Police believe Hogans pulled the trigger in this case. Kemp and Watkins both had prior felony convictions that required the life sentence.

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Prosecutors said that on July 1, 2011, the trio set up Derek George Gray Jr. for a robbery. The defendants then shot Gray in a Ford Taurus, which was later found burned in Union City, before discarding the body off Circle 75 Parkway.

COBB COUNTY, Ga. -- Police have charged one man and are questioning two other people in the shooting of a Cobb County police officer.

The suspected shooter was found hiding a stairwell in a house just south of Interstate 285, about a mile from the scene. Two other people -- one man and one woman -- were detained and are being questioned by police.

The suspect, 36-year-old James Albert Phillips, was found after an all-out search with more than 100 officers by air and on the road. A team of patrol officers noticed something usual at one property and investigated, where they found the suspected shooter.

"The officers were just out doing a routine check, looking around as we normally do in this type of incident, and they came upon him," Cobb County Police Sgt. Dana Pierce said. "I don't know whose home. It was not (the shooter's) home. At this point, we believe it may have been abandoned or closed. Nobody was home at that point."