Detectives with the St. Johns County Sheriff's Office are investigating an armed robbery that happened just after 5 p.m. Tuesday at a Marshalls store.

Deputies said a man went into the store in the 1700 block of U.S. 1 South and demanded money from clerks working at the store.

Deputies said that according to eyewitnesses, the man had a black handgun in his waistband and left the store heading northbound on foot carrying a Crown Royal bag with an undisclosed amount of money.

The robber is described as a black man in his mid- to late-20s, about 5 feet 3 inches to 5 feet 6 inches tall and between 125 and 135 pounds.

He was wearing blue jeans, a bright yellow shirt with a white undershirt, oversized eyeglasses and a black hat.

A Sheriff's Office K-9 tracked the man to the rear of the store, where the scent ended, deputies said. They said it's possible a vehicle may have been waiting on the man in the area behind Marshalls.

Anyone who may have been in the area or may have any information related to the robbery is asked to call Crime Stoppers at 888-277-TIPS.