Niagara police are investigating after an armed man robbed a St. Catharines convenience store.

Officers were called to an armed robbery in the area of Pelham Rd. and Galbraith St. around 4:40 p.m. on Wednesday.

Police say a man entered the store with a large knife and demanded the cashier hand over cash from the register.

Investigators say the employee did not suffer any physical injuries during the interaction.

Detectives reviewed the store’s surveillance footage and discovered the man had been wearing a Halloween mask during the robbery.

Police say the suspect was a white, roughly five-foot-ten and was wearing a black jacket with grey sleeves and a grey hood, dark blue jeans, and blue shoes with white soles.

Anyone with information is asked to contact detectives at 905-688-4111, ext. 1009964