Tucson police are seeking public help to identify a pair of robbery suspects who have held up several convenience stores at knifepoint.

Detectives determined that the man and woman, who recently hit a Circle k at 1602 E. Broadway, also were behind nine other similar incidents around the city, the Tucson Police Department said on its Facebook page Friday.

In the Circle K incident, the male suspect flashed a knife at the clerk and demanded money while the female stole cigarettes from store shelves.

Police described the male as a dark-skinned Hispanic in his 20's, about 5'10" and 180 lbs. The female was described as a light-skinned Hispanic in her 20's, about  5'6" and 140 lbs.

"If you see either of these two suspects you are asked to call 911 immediately and DO NOT approach," TPD said. Anyone with information is asked call 88-CRIME.