For the third time this year, the Nickelodeon Cinemas in downtown Portland has been robbed.

According to police, a man entered the movie theater on Temple Street around 10 p.m. on Tuesday and approached the clerk. He held a handgun and demanded money.

The female clerk told police that she gave an undisclosed amount of cash to the man, who fled on foot.

The suspect is described as a white male, about 30 years old, 5 feet 8 inches tall and weighing about 150 pounds. He was wearing a gray hooded sweatshirt and blue jeans.

Police said the Nickelodeon had previously been robbed in January and April of this year. Detectives are investigating whether the robberies are connected.

Anyone with information is asked to contact the Portland Police Department at (207) 874-8575.