Police are currently at the scene of an aggravated robbery that occurred at a business overnight, according to SA Police.
At 1.30am police were called to a Bank SA branch on Sturt Road after reports a man armed with a knife confronted and threatened a cleaner as he was leaving the building.
The offender then allegedly entered the bank and left shortly after taking a small bag containing documents.
No one was physically injured during the incident.
Police searched the area with the assistance of a police dog but were unable to locate anyone.
Sturt CIB and crime scene will be attending the bank this morning to continue the investigation.
If anyone has any information that may assist the investigation please contact Crime Stoppers on 1800 333 000 or report online at https://crimestopperssa.com.au