THIEVES have been targeting Carphone Warehouse in Brentwood, making off with hundreds of pounds worth of mobile phones and tablet computers.
The raiders are believed to park their car around the corner from the shop before charging in, grabbing display phones from the walls and running out.
The High Street store has been hit on three consecutive Mondays at around 4pm. The first raid was on October 8.
An employee of the Brentwood shop, who asked to remain anonymous, said: "It appears to be the same group of lads. You don't really see their faces, but they are all wearing hoodies. Sometimes there are two in at once, other times there can be five. They come in and just rip things off the wall, coming to us and saying 'Yeah, what you gonna do about it?'."
Despite the continued and consistent attacks, the Carphone Warehouse have not improved the store's security.
A spokesman for the company said: "The safety and welfare of our employees is our number one priority and thankfully nobody was hurt in this instance. We are working closely with the police on this and assisting them with their enquiries."
He added: "There is a difference between snatch and grab instances and someone being threatened with a weapon. I do appreciate, however, that both examples are still scary, which is why we are working very hard to prevent them."
Attempts to identify the thieves were thwarted, when the discovery was made that the county council had built a sign in front of the nearest CCTV camera.
A spokesperson for Essex County Council, which placed the sign, commented: "Essex County Council has not been informed of any issues with road signs in the Brentwood High Street area that are causing concerns with CCTV monitoring.
"The County Council has a statutory duty to install road signs for the benefit of all highways road users. CCTV camera positioning and installation is the responsibility of the Borough Council."
The Brentwood Borough Council added: "The door to Carphone Warehouse can't be seen by CCTV camera because of the sign but approximately one metre either way of the door can be seen. The CCTV camera covers many shops in the High Street."
A spokesman for Essex Police said: "We are aware of these thefts, but they do not necessarily form any sort of regular series, with apparently different people and different methods and targets."