Police in Neshannock are investigating the armed robbery of J&M Mini Mart on Mercer Road.
It happened at 6:42 p.m. Thursday, according to police.
Investigators say an unknown man entered the store wearing a dark hooded sweatshirt and camouflage-colored face mask. He showed the employee a small handgun and demanded money.
The robber then left southbound with an unknown amount of cash.