Northern Territory Police are searching for two youths who were allegedly involved in an aggravated assault overnight in Alice Springs.

Around 11:45pm, a 13-year-old staff member working at a takeaway shop on Railway Terrace exited the building when he was approached by two male teenagers.

It is alleged one of the teenagers assaulted the victim while the other attempted to steal his personal belongings.

A bystander intervened, at which point the two teenagers allegedly threatened them with edged weapons before fleeing the scene.

Police attended and the incident is under investigation.

Acting Commander Robert Griffiths said Strike Force Viper has carriage of the investigation.

"This is a particularly concerning incident involving a 13-year-old who was simply carrying out his duties at work.

"No one should be subjected to this type of violence or intimidation, particularly a young person in their workplace.

"The incident has been captured on CCTV, which has been obtained by police.

"Anyone who witnessed the incident or has information that may assist in locating the two individuals is urged to contact police on 131 444."