The Northern Territory Police Force has arrested a youth in relation to an aggravated assault in Darwin overnight.

Around 1am, police received a report that a 16-year-old male was refused entry to a nightclub in the CBD. The 16-year-old has allegedly then sprayed two security guards with OC spray, striking one guard in the forehead and the other to the back. Both guards did not feel any effects or require any medical treatment.

The youth was arrested by police and remains in custody with charges expected later today.

The OC spray used was seized by officers and has been found to be an illegal OC spray that cannot be purchased in the NT. Investigations into how the youth came into possession of it are ongoing.

Anyone with information is urged to contact police on 131 444 and quote reference P2525496. Anonymous reports can be made through Crime Stoppers on 1800 333 000.