PORTSMOUTH - Police are investigating an early morning burglary at a Deer Street jewelry store.

Police received an alarm call from Chrisrial and Company Jewelers at 28 Deer St. around 4 a.m. Thursday.

Within minutes, patrol officers were on scene and discovered the glass door to the building and an entrance door to the jewelry store itself had been smashed. Police said a 30-pound dumbbell left at the scene was used to break both glass doors.

Several glass cases were also smashed and an undisclosed amount of jewelry was taken. Police said the suspect fled on foot.

Video surveillance captured images of the suspect who is described as a man of medium height and medium to heavy build. Police said he was wearing blue jeans, a dark belt, black boots, a black jacket or sweatshirt with a hood, light-colored gloves and may have had a dark mask covering his face.

Portsmouth police officers along with a New Hampshire State Police K-9 unit conducted a search of the area but the suspect was not located.