A group of men is believed to be behind six armed robberies of cabdrivers in Fairfax and Prince William counties and another jurisdiction. Police are asking for the public’s help in identifying the perpetrators.

The robberies, which began in December 2012, target cabbies after they have parked their cars, Fairfax police said. The suspects in the cases are described as black men in their 20s. They wear dark clothing and brandish handguns.

The first suspect is about 5 feet 10 inches tall, 175 pounds. The second suspect is about 6 feet 2 inches tall, 180 pounds. The suspects have been seen driving taxi cabs during these reported robberies. Detectives have determined that these cars were previously stolen and then abandoned after the robberies.

The robberies occurred on the following dates:

Monday, Dec. 3, 2012, Fairfax: A 39-year-old driver parked his cab near Eighth Street and Lincoln Avenue and exited shortly after 6 a.m. when another cab pulled up behind him. The driver exited, brandished a gun and demanded money. The victim complied and the suspect fled.

Saturday, March 30, Fairfax: A 34-year-old driver was walking to his cab in the 5100 block of Lincoln Avenue about 6:30 a.m. when two suspects exited another car, brandished a handgun and took property from the victim. Both suspects fled in the other car.

Thursday, June 20, Fairfax: A 51-year-old driver parked his car in a parking lot in the 6500 block of Cherokee Avenue about 2:10 a.m. Two suspects exited another vehicle, each brandishing guns. They took money and property from the victim and fled in the other car.

Friday, June 21, Prince William: A 54-year-old driver parked his vehicle in the 14000 block of Baneberry Circle at 3:48 a.m. and he was approached by two suspects, one with a handgun. The suspects took property from the victim and fled in their vehicle.

Sunday, June 23, Fairfax: A 29-year-old driver parked his cab and exited in the 6400 block of Wingate Street at 3:45 a.m. He was approached by a suspect brandishing a handgun. The suspect took cash and property from the victim and fled in another car.

Another robbery in a nearby jurisdiction is believed to be related.

Anyone with information about these suspects or the robberies is asked to contact Fairfax Crime Solvers or Prince William Crime Solvers by phone at 1-866-411 TIPS (8477). Tipsters may also report their tips anonymously by e-mail by visiting www.fairfaxcrimesolvers.org or by texting “TIP187” plus your tip to CRIMES (274637). A $100 to $1,000 cash reward is being offered by each Crime Solvers program for information that leads to an arrest in their jurisdiction. As always, tipsters never have to give their names or appear in court.