Police are investigating a spate of armed robberies within hours of each other, including a man who used a hammer to hold up a business in Brisbane’s south.

The man demanded money from the attendant at a shop on on Rosemary Street, Durack, about 11.15pm on Monday night.

The worker wasn’t hurt but the hammer-wielding bandit escaped with an undisclosed sum of cash.

He was described as Caucasian in appearance and about 30 years old.

He was wearing prescription glasses, a blue hooded Mambo jacket and black track pants with white stripes on the sides.

About two hours earlier in New Farm, police allege a man with a knife threatened a worker in a Welsby Street business but fled empty-handed when an alarm was activated.

The 23-year-old Fortitude Valley man was charged with one count of attempted armed robbery to appear in court on Tuesday.

But police are still hunting a man who used a box cutter to hold up a service station in the Logan suburb of Mount Warren Park about 4.45pm on Monday.

They have released CCTV images of the man wearing a red bandana, who ran away with a sum of money.

Anyone with information should call Crime Stoppers on 1800 333 000 FREE.

Extracted in full from the Brisbane Times.