Northern Territory Police have arrested a 14-year-old male in relation to a robbery in Katherine last Tuesday.

At about 6:45pm, two youths attended a store on Giles Street, where they allegedly assaulted an employee and stole cash from the till.

The 14-year-old youth is expected to be charged later today.

Police are still continuing with investigations into the identity of the co-offender.

Anyone who may have witnessed the incident or has information is urged to contact police on 131 444 or via Crime Stoppers on 1800 333 000. Please quote reference number 9577700.