Robstown police were continuing their investigation Tuesday of an armed robbery that occurred early Monday at a Robstown convenience store.

Police said a Hispanic male in his late teens or early 20s walked into the Snappy Convenience Store at 701 E. Avenue J two times early Monday, looking around each time.

The suspect returned a third time and pulled a blue or black semi-automatic pistol from his waistband and pointed it at the store's clerk, demanding that the clerk open the cash register and pull out the money drawer and put it on the counter, police said. The suspect took about $184 from the cash drawer and ran out the front door of the store, police said.

Police said the store's clerk called 911 at about 6:21 a.m. Monday and reported that he had just been robbed at gunpoint. The robber, described as about 5-feet-8-inches tall with a thin build, was last seen running out the convenience store, detectives said Tuesday. Robstown police asked for anyone in the community that could assist with identifying the suspect in the aggravated robbery to call the station at 387-3531.