Police have arrested a 15-year-old male in relation to an aggravated assault that occurred in Woodroffe this morning.

Around 9:20am, the Joint Emergency Services Communication Centre received reports that a male youth had allegedly assaulted two men outside a business on Baldwin Drive after stealing items from inside the premises.

It is alleged the youth stole multiple items from the business and a bystander who witnessed the theft attempted to intervene outside the premises. The youth subsequently assaulted the 64-year-old bystander multiple times to the head before the business owner was alerted to the commotion and came to assist the victim.

The offender then allegedly assaulted the 77-year-old business owner before dropping the stolen items and fleeing the scene.

Police and St John Ambulance attended, and both victims were treated at the scene.

A 15-year-old male was located and arrested at a bus stop on Essington Avenue.

He remains in police custody with charges expected to follow.

Police urge anyone with information to make contact on 131 444 quoting reference number P25289542. Anonymous reports can be made through Crime Stoppers on 1800 333 000 or via https://crimestoppersnt.com.au/.