A 40-year-old Theodore man has been charged after an alleged armed robbery at a bottle shop in Tuggeranong on Wednesday night.

Police said a man entered a liquor store inside the South.Point shopping centre in Greenway about 7pm and allegedly produced a knife while demanding cash from a staff member.

The staff member complied and the man left the store a short time later with cash.

About 8.30pm, police received information the man was travelling on a bus in Woden. Officers located the bus in Mawson and arrested the man.

During a search, police allegedly located two knives.

The man has been charged with aggravated robbery with an offensive weapon and possessing a knife without a reasonable excuse.

Anyone who witnessed the robbery should contact police via the  Crime Stoppers website or on 1800 333000.