Springfield, Tenn., police thwarted the 13th in a string of seemingly related Blockbuster Video robberies Monday. Three of those robberies have happened in Bowling Green. Springfield police charged Matthew M. Jackson, 19, of Nashville, Tenn., with aggravated robbery in connection with the incident there, Springfield police Lt. William Watkins said. About 10:30 p.m. Monday, two (women) clerks were closing up to leave when a masked person approached them as they were locking door, he said. He forced them back in at gunpoint and robbed the store. The man then forced one clerk to undress and attempted to sexually assault her, he said. But a police officer patrolling the area noticed unusual activity in the store. One of the clerks was able to signal (the officer) that something was wrong, Watkins said. When police entered the store, the man fled out the back. Officers were able to catch him only a short distance away, Watkins said. While Watkins said circumstances of Mondays robbery were unusual for Springfield, similar crimes have happened in Bowling Green and in middle Tennessee. Bowling Green police detectives were in Springfield on Tuesday to interview Jackson in possible connection with the three Blockbuster robberies here, crime analyst Barry Pruitt said. The latest of those robberies came a week ago at Blockbuster on Campbell Lane, where a man brandishing a gun demanded money of the clerks at closing. He also forced one of the women to remove her clothes and fondled her, police said. Two weeks earlier, Blockbuster on Scottsville Road was robbed, but male employees were staffing the store at closing. The Scottsville Road site also was robbed in July; an 18-year-old woman who was closing then also was sexually assaulted, police said. Since those robberies, Blockbuster has beefed up security measures here, management said. Several law enforcement agencies have expressed interest in interviewing Jackson, Watkins said. Other charges will likely be filed later, he said. Because Jackson still was being interviewed and processed Tuesday morning, no bond had been set. He was to be lodged in the Robertson County, Tenn., jail.