Detectives investigating an armed robbery at a service station near Falkirk have spoken to motorists and passers-by one week after the incident.
Two masked men attacked two security guards as they transferred cash from the garage to their van at Murco Bowhouse Service Station on 5 August.
It is thought they were driven off by a third man in a silver Audi.
Police revealed the men escaped with £20,000 from the garage, which was also the target of a major robbery in 2006.
Det Insp Ronnie Isles, leading the investigation, told how the two guards were standing near the cash machine at the service station when they were approached by the masked men at about 1300 BST on 5 August.
He said the men, described as between 5ft 5in and 5ft 7in tall, were carrying a weapon.
There was a "short exchange of words", during which one of the criminals spoke with an English accent, before the men attacked them, striking one of the guards on the upper body with a solid object and injuring him.
They grabbed a container with the money and ran towards a silver Audi sitting nearby.
Det Insp Isles said both guards were left "badly shaken" by the incident, which took place at the same spot as a robbery in 2006, when another five figure sum was stolen.
He said: "This is a major incident. There are currently 12 detectives working on it. We are looking at all possibilities, and using CCTV footage and witness reports.
"The service station employees did not notice anything, but there are some witnesses."
The detective said police were looking at the 2006 robbery to see if there were any similarities.
He added: "The whole point of today is to jog people's memories. They may have been driving past the service station or even stopped at it prior to the incident.
"I want to hear from anybody who may have been in this area prior to 1pm last Thursday."
"In particular I am keen to hear from anybody who may have seen a silver Audi car in the area."