Newly-released surveillance video offers a detailed look at one of the robberies, and detectives hope the images will help put an end to the crime spree.
The robberies started at a Tacoma hamburger stand late last month, and the thieves have struck another five times since then. Two of those businesses were targeted twice.
"It was pretty scary. The first time it was two guys and the second time it was four," said Willy Hammond, owner of Big Willy's convenience store.
The first time the thieves hit Big Willy's was on Halloween, when neighborhood children were flooding the store for free candy. One trick-or-treater found himself staring down the barrel of a gun.
"We had a little kid come in, and the guy pointed a gun right at him," Hammond said. "You know, like a 10 year old."
Detectives say the robbers gang up on store clerks while accomplices steal beer and packs of cigarettes. The gang's ringleader forces the employee to empty the cash register at gunpoint.
"One people came, they just open, big money. Big money, but it small money," said convenience store clerk Rana Choo.
Choo said the robbers even forced two customers to carry beer outside and load it into their getaway car.
The crooks cover their faces during the robberies, but investigators hope the new surveillance video will help nab them before anyone gets hurt.
"We have had our issues in the past, but never anything like this," Hammond. "It's getting scarier around here. It's not safe. Good people move out of the neighborhood when it gets like that."
The robbers have gone underground in recent weeks, ever since a witness fired a shot in the air during the last holdup.