Police investigating the armed robbery on the Nationwide in Newtown on Monday night are searching for information on two Audi cars they believe to be involved.
Police are looking for a White Audi A3 and a grey Audi A4, which were seen in the area at the time of the incident and are believed to be involved.
The vehicles were also seen travelling along the A483 during that period. If you saw these vehicles between 6.30pm and 10.30pm, call Dyfed-Powys Police on 101, or the independent charity Crimestoppers anonymously, on 0800 555111.
Tens of thousands of pounds are believed to have been taken in the raid when raiders used hammers to break down the door and attack security guards.