A 43-year-old man was injured in a shooting inside his south Nashville home Thursday morning. Police reported four gunmen entered Son Tan Nguyen's home located in the 400 block of Tampa Drive off Paragon Mills Road around 9:30 a.m. as a delivery was being made to the residence. After firing shots, the four gunmen fled the scene with a laptop computer and a purse. Nguyen was transported to Vanderbilt University Medical Center where he was last listed in critical condition. Police said at the time of Thursday's shooting, Nguyen was serving a nine-year probated sentence for an attempted second-degree murder conviction relating to a 2006 stabbing. A motive for the shooting remains under investigation. Immediately following the shooting nearby Paragon Mills Elementary School was on lockdown as a precaution. The lockdown was lifted just before 11 a.m., according to Metro school officials.Anyone with information on the suspects is urged to call Metro police or Crime Stoppers at 74-CRIME.Refresh this page for updates on this story.