Police believe number plates on a getaway car used for an armed raid on two bank couriers in Hampshire were stolen from the area on the same night.
The robbers, armed with an axe and an angle grinder, attacked the guards at the Nationwide in Park Parade, Havant.
Officers believe the number plates were stolen from another car in Highlawn Way or the surrounding area on Friday.
It is also thought at least three people were involved and police have released descriptions of two of them.
Black VW Golf
One man is described as at least 6ft tall, wearing a balaclava and dark clothing with a southern accent.
The other is described as shorter and stockier than the first but he was also wearing a balaclava and dark clothing and had a southern accent.
The men took four cassettes "containing a substantial sum of money". The G4S staff sustained minor injuries.
Officers said they could not say if the robbery was linked to a raid at an HSBC in Chandler's Ford on Thursday.
The robbers used a black VW Golf to drive away from the bank.