Raider escapes with cash from Nationwide, Little Common
Police are appealing for witnesses.
The Sussex Police helicopter was used to search the Little Common and Cooden area but without success.
Two female and one male member of staff were on duty at the branch when the man walked in and demanded "all" the cash.
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Hide AdWhen staff hesitated, he produced a bag and brandishing it as if it contained a weapon, threated them.
Police were this afternoon interviewing staff before issuing a description of the wanted man, who is thought to have been hanging about near the Nationwide for some time before the raid.
The branch was shut and the pavement in front of the building cordoned off as police began their investigation.
Did you see anything of the raid - let us know.