Armidale Police and Tamworth Child Abuse Squad are continuing their investigations into James McKenzie, 35, who was running a piercing business in Marsh Street, Armidale.

The additional charges relate to offences allegedly committed against teenagers, aged 16 and 17, from Port Macquarie.

He has been charged with two counts of aggravated sexual assault on the 17-year-old, and is accused of indecently assaulting the 16-year-old.

McKenzie is already facing charges involving a teenage girl from Armidale that he allegedly met on social media in March.

He was charged with perform body piercing on any part of the nipples of a child, procure a child for unlawful sexual activity, produce child abuse material, intentionally sexually touch a child and three counts of aggravated sexual assault.

Armidale police are asking for people to contact them if they have any information.

Phone Armidale police on 6771 0699 or contact Crime Stoppers on 1800 333 000.

Police said information is treated in strict confidence.