An investigation is underway after a young woman working alone at Albion Park Subway restaurant was robbed by a man who claimed he had a gun.
Lake Illawarra Police inspector Aaron Wunderlich said police responded to a hold-up alarm at the Terry St eatery 8.10am Monday.
Polie have been told the man wore a mask and "referred to having a firearm in his waistband" as he demanded cash, before fleeing on foot towards Russell Street.
Police say the employee complied and was not physically harmed.
"She's obviously very shaken," Insp Wunderlich said.
"Police responded very quickly to this incident and spoke to her. We provided her support ... she's doing as well as can be expected."
Police are now reviewing CCTV footage as part of their investigation.
The man is described as being of Caucasian appearance, with ginger hair, aged in his early 20s.
He was wearing black pants, a dark blue hooded jumper and a blue mask.
Anyone with information is urged to contact Lake Illawarra police or Crime Stoppers on 1800 333 000
This story has been updated.